The guy was going over VTT's results, and he said there was a lot of troubling things in there, and it looked like Donut Labs was misleading people.
He said the battery looked like a lithium battery based on it's power curve, power density, and other data.
And there was no proof presented that it was actually solid state.
I just watched the 8 min long test it looks like a typical power curve for lithium chemistry. The kinetics are set by the ion size lithium being smaller than sodium for example. Which CATL has got to do 5C charges with the larger sodium ion radius.
VTT has no reason to lie they are the independent tester. This is how science is done you hand the device to a third party and day break it if you can.
Every major player is doing a solid state cell, BYD,CATL,Toyota,Nissan,Benz,Panasonic the list is well everyone it’s when not if.
I saw that video as well.