There aren't claims, these are physical constraints. For heavy vehicles such as trucks and busses (and trains) there might be a market, provided the H2 is an otherwise unused byproduct of some process and needn't be produced, but for the majority of personal mobility major breakthroughs are required to make it competitive.
The biggest issue is the need to build out an entirely new fueling infrastructure with a highly explosive fuel. EVs can piggyback off of the existing electrical grid.
To replace fossil fuel transport will require an entirely new infrastructure regardless - if it's electric the existing grid will essentially have to be built out by a substantial factor.
A hybrid future is entirely feasible with long established city to city truck transport routes using hydrogen from dedicated planned end points and mid points along with lighter EV vehicles and non standard route EV trucking.
So much denial in the anti h2 crowd.
I'm not anti H2, why would I? I'm not part of any crowd. I just did part of my physics training on the subject.
20 years ago, while there were more H2 vehicles on the road, nobody in the H2 storage fields thought it would last. On a basc level, the physics of getting electrons out of a material is better than getting protons out. And then there is an already preexisting infrastructure for free.