Super capacitors have been possible for a while.
The problem they and this new iteration have is explosive discharge.
If a gas tank on a vehicle is damaged you get a leak, maybe a fire. It would have to leak for a bit and build up a vapor that was later ignited to get an explosion.
Super capacitors make a big boom every time one with a big charge is damaged.
These are MICRO-SuperCapacitors, meant for low voltage requirements...Even a common alkaline or carbon cell will get hot enough to burn if a short circuit is applied..................