Water-injected 2.0-liter hydrogen engine makes 410 horsepower

Probably not, but it's hard to say really: Teslas haven't been very reliable at all and have had to have their drive motors replaced, whereas modern gasoline engines by Toyota seem to be ridiculously reliable. Reciprocating engines may seem quaint, but with so many decades of work and development, they (or at least some manufacturers) seem to have made them some of the most reliable mechanical machines ever devised. (Of course, this doesn't apply to all manufacturers; I wouldn't count anything by Chrysler here.)

What does seem quite clear is that using hydrogen in an ICE necessarily means a huge hit in efficiency because of the thermal cycle. Why anyone would want to waste time on this solution instead of just jumping straight to the fuel cell + motor drivetrain, I don't know. It's like having a cellphone company and making a fancy new flip-phone when everyone else is moving to smartphones.

If you are a little allergic to calling hydrogen blue or green, depending on how much greenwashing it receives, that might not be the best keywords to type in a search engine. But hydrogen should become a needed industrial step for the world's second or third most widely used commodity (it goes: sand, cement, steel, glass, gravel, petroleum, macadam, wheat…)

I’m not sure what’s #2 on the list of actual hydrogen uses, as most big potential applications could use an easier fuel to handle than a literal cloud of angry protons. It's often a good first step, though: ammonia, synthetic methane, etc.

Far down that list, there’s also a project to put hydrogen back into dirigibles, which I find very engrossing (and yes, the people working on that have heard of the Hindenburg), but it's less solid than making steel.