The CO2 should have to escape through whatever opening is created, and ripstop is pretty standard for this sort of thing, keeping openings small. A venting liquid CO2 tank would be limited by evaporation.
The danger zone would depend on the size of the hole, but like old CO2 fire extinguishers, CO2 tends to disburse fast, and the lethal range for it is drastically higher than things like carbon monoxide, ammonia, and such.
Plus, think of the future! An EV would operate just fine, and a couple minutes would get you out of danger.

It is a closed loop system. Smallish tanks for the liquid co2, great big football field or larger dome for gaseous CO2. Website does not have dimensions, I'd guess the dome varies in size based on total energy desired.
As such, it is like worrying about the inner loop water in a nuclear reactor. Since you theoretically only need that initial charge, it rounds to zero per unit of energy over time.

Reading the site page, it is closed cycle. The big gas dome holds more or less atmosphere temperature and pressure CO2. There are one or more tanks holding relatively non-cryogenic liquid CO2.
When there is excess power, pumps liquify CO2 into the tanks. When power is demanded, evaporating CO2 goes through a turbine to produce power, then into the dome.
Water is used, most likely to cool the freshly compressed CO2, and warm expanded CO2 after the turbine.

Unfortunately, Waymo hasn't yet installed shoulders on their vehicles. :-)

Standards

Maybe Trump will open his own chain of theaters - or simply rename an existing one, like he did with the Kennedy Center - patrolled by the National Guard (or ICE, or the Marines, ...) with the kicker being that those agents will have to buy tickets too. Cha-Ching! /s

Looks like this administration, and its rich/corporate supporters, are looking to train up people and test out technologies on the public's dime then hire those they like best. Another graft from the Dear Leader and his billionaire friends? /cynical

"Picture Avatar sequels stamping on a human face forever."
    --James Cameron

Meritocracy is what leading institutions do to achieve world class research, which is one reason why the best research is increasingly NOT happening in the USA. Meritocracy is color blind, and whatever is between one's legs does not enter the calculus of whether an idea is valid or not. Interestingly, they talk about the achievements of this institution what happened in the 50s-90s, not what they've done since 2010.

I will give DEI one thing: what it does, if properly implemented, is bring in people with diverse and varied life experiences. I'm even willing to admit that might be advantageous; oftentimes a different point of view is valuable. However, it also brings in a lot of distractions and people who occupied the bottom rungs of their class scores, and grading curves shifted lower due to underachievement--but the administration will not accept most of the class failing. The optics would be HORRENDOUS.

If I find myself or my family members needing to go under a knife, I do not want my surgeon and anesthesiologist to be diverse. I naturally want them to be the best, the most experienced professional in their field. Recognizing that it's not possible to always get those people, we have to accept that we may get someone with middling competency, who passed at the bottom of their class. Fine, they are called doctor as well. What we should not accept lowering of those standards just to bring in an underrepresented, underperforming doctor. Sorry not sorry.

Same with pilots. I don't care if the pilot of my plane is an albino, trans, polka-dotted moomoo-wearing Eskimo, as long as it doesn't distract they them performing their duty. I want them to be a GOOD, safe, competent pilot, who earned their position because they demonstrated merit, not because they were shoehorned and kept in the job by a DEI cultist in HR despite numerous repeated near-misses.

MAGA is an ever decreasing circle of those arbitrarily deemed "MAGA enough" with people (usually permanently) excluded for even the slightest digression, though Indulgences can be purchased at the (new) White House MAGA gift shop.

Who could also be impeached, then the current Speaker of the House would become President. Not really sure that would be a good course for the political mood of the country as a whole.

Better that the MAGA crowd have to suffer through the consequences of their votes to (hopefully) learn a lesson about electing a greedy, pathologically lying, narcissistic, racist, etc... sociopath who really only actually cares about himself and a little for those who pray and pay before him. I'll give people a bit of a pass for giving Trump the benefit of doubt during his first run for office but, seriously, it's not like there wasn't any evidence Trump was like this, especially during/after his first term. Granted, perhaps many politicians have some of those characteristics, but few, if any, others have them all like our Dear Leader. That he's pretty checked-out during this second term and happy to let his minions pursue their own horrible agendas is pretty bad though. This is a tough lesson the the country.

Or listen to Trump himself -- or use "Trump Math" so he can bring down drug prices 500%, 1200% ...

(So much stupid, and/or willful ignorance. *sigh*)

That doesn't bode well for his penis. :-)

This includes Putin ...

This is short sighted, of course, as climate will affect businesses and a lack of research and understanding will ultimately hurt those businesses, and the rich people, because they'll have less information for long-term planning and operations. But hey, they'll get rich over the next quarters or so, so fuck that. /s And, of course *they'll* be rich enough to move ...

Quash, not refute - interesting.