Sounds promising but knowing the actual temperature rise is essential and not stated.
I am sure as they move from lab to preproduction testing they will have to include some fan based cooling the point here was they were able to push 11C worth of current into it and 1 it didn’t melt down or puff up and bent gases. And 2 they used passive aluminum plates as heat conductors then removed 50% of that and left the top open to bare air without forced air on it. What this shows at the very least is the internal ohmic resistance is low enough it didn’t turn into a joule heater. This was as much a torture test as a shut the haters up test. Beautifully done take it charge it as fast as you can pull half the heat sink away and charge it as fast as you can again. This was a proof of concept test. From the curves and retained energy concept proven 98-99% at a charge rate that would melt a NMC cell even with heroic liquid cooling as full blast. Then pull half the sink away and say hold my beer and do it again. Yeah concept proven. Good on them this is how you science with a flair of suck it haters at the end.