That's a disingenuous claim.

Planes have big engines and can generate a great deal of lift. That means their fuel can be housed inside safe tanks of metal.

An airship needs to have thin lining around its lifting gas in order to fly. One can make the argument that recent progress in materials engineering makes it possible to have material that is thin but strong -- and I know next to nothing about the state of materials engineering -- but that does not change the fact that for the past few decades, a hydrogen airship would have introduced a great deal of risk for no good reason.