Yes, but turning electricity into hydrogen doesn’t have 100% efficiency, during transport, storage and filling the car with hydrogen you lose some of it and only then you get to the fuel cell, which isn’t very efficient in itself. And then you lose a bit more (although very little) in the electric motor. All this amounts to the 22% of the guy above (didn’t check the number btw, but it sounds plausible)

and can replace batteries of EVs right?

Toyota bet on this and it didn’t go anywhere in the US. They’re pivoting to battery EVs.

Even countries that invested heavily in hydrogen are pulling back - like Denmark eliminating all hydrogen stations. https://energywatch.com/EnergyNews/Renewables/article16432608.ece