From what it reads, it only works when someone cuts the lock with an angle grinder, meaning it may be something that is ignited by heat in order to work, plenty of circumstances where such ignition could be severely delayed (eg. in cold climates). If it's just compressed gas, any sort of metal issues (fatigue, bad welds or rust) or impact could release it (eg. if the biker gets hit by a car).
Terrorism charge is the first thing that springs to mind what you'd get charged with if this gas either intentionally or accidentally gets released in a public area (such as a bike stand).
I doubt it is a heat triggered mechanism, more like simple cheap dumb solution; the likely mode of suspected failure is cutting through the D loop which is probably just hollowed out with pressurised gas in it. If it is that the problem is the method of failure for most is they are popped out with portable bottle jacks NOT angle grinders. It just tears out where the Dloop end mates with the end bar if it is anything like normal locks, so it is just as insecure. I have a very expensive bike and never had a problem as I know there is no such thing as thief proof lock.
My bike is very expensive custom I built to spec I needed from scratch and my lock is decent but I know full well it wont stop thieves, the independent tests show it is highly rated because it will just slow down thieves around 60seconds if they are good. With that in mind I only leave it unattended for short periods in places know; pro thieves go equipped but tend to check particular spots I'd not leave my bike at. If there are a few other bikes that can be taken in 10seconds they'll take them before mine especially in high traffic areas as they are worse than very isolated places for pro thieves generally, opportunists take much longer and can't deal with locks as fast or at all due to equipment and oft wont steal it in full view of public like a pro thief will without raising eyebrows of some passers by (people don't give a shit most the time though).
My antitheft device design would work much better (this is a joke btw I've not really rigged this). Carry a customised seatpost with crappy seat (heat treatable steel tubing is cheap), shim post as needed to accomodate the frame, put a block with crude firing pin inside the frame seattube and as big a gauge you can get shotgun slug inside the seatpost. Loosen the seatpost bolt just enough that it gives but only when weight is on it. Obviously joking (shotgun slugs aren't available here unlike shot) but it'd stop them stealing plus you'd have an audible alert when it was taken so you could get the bike back for the price of a hose down and new sacrificial seat (again this is totally tongue in cheek don't do this. Forgetting to swap to your proper seat would also be worse than the legal problems of doing this). TL DR use better than average lock, don't leave your bike unattended for long time, in hotspots or very isolated or sketchy places. Low hanging fruit tends to be the main target.