That’s really not impressive. Lots of people converted their vehicles to run propane or NG during the 70s oil embargo. You can do it with pretty much the exact same piston engine.
BEVs are far better and yes cleaner.
More production means prices will drop and eventually it would get a lot cleaner to produce it as well.
Funny that you think this of hydrogen, but not of batteries. Given that I’ll say cheers.