I think you covered most of my objections, the only thing I'd add is that the expensive catalysts have (or had? surely it's improved?) a sharply limited lifespan, so your $60k fuel cell could only run for 1000 hours before requiring a full rebuild.

Basically these "H2EV" things are EVs with a range extender, and the fuel cell range extender that they're using is in all ways inferior to a biodiesel or ethanol fueled range extender.