What a brilliant idea: Take a high-current DC charging port, plug in an inverter...
Hate to stop you so soon, but there's no "plug in an inverter step." If you'd actually read the article, you plug in a 120V cord just below the rear bench seat. Done.
OR, you might read the comment that I was replying to...
I did. Yet the part that you quoted and responded to had nothing to do with DC-to-DC direct links.
If no that then most EVs have a portable charge cable of some sort, one that can plug into a common 120VAC outlet often seen in vehicles for a "trickle charge". Most cars have a 120VAC outlet somewhere that can provide some power.
Based on a quick web search, the cars that have outlets are (a) mostly pickups and minivans and (b) often rated for 100W or 150W max supply. You'll be waiting a long time to charge an EV for even a few miles of travel at 150W. Some pickup trucks have heavy-duty outlets (up to 2400W), but they're the exception.
An EV6 is (a) not a pickup or minivan and (b) rated for far more than 100W or 150W supply.
And then as the Emmett would say, the piece of resistance, which is simply wrong regardless of what you imagine that you're replying to (I'd imagine it was the part that you took the time to quote, reproduced here in bold, but then, I'm not as brilliant as you).
and realize that the relevant cars with electric outlets are fossil-fueled.
The EV6 is a pure BEV.