It doesn't say anything about range, but it seems it's a pretty small ferry. There are already much larger ferries that are battery-electric (largest one is the Bastø Electric in Norway, which can deliver 600 passengers and 200 cars), so I'm wondering a bit what the point is.

Hydrogen is a less efficient way of using renewable energy than using electricity directly via batteries. The only reason to use it in shipping is that for larger ships and larger distances batteries are not feasible.

DFDS is planning to convert a large ferry between copenhagen and Oslo to hydrogen: https://www.dfds.com/en/about/media/news/hydrogen-ferry-for-...

That's the kind of project where hydrogen makes sense.