Storage matters for widespread direct-consumer use of hydrogen, but in the example I gave it's not a big deal: just put the electrolyzer next to the solar panels. You only need to store ~12h of hydrogen production, and burn it onsite.

A more realistic world won't be implementing the Dumbest Possible Refutation, and would overbuild solar less than this in the first place. In that case you do care a lot more about storage, and that's a large part of why I suggested ‘synthetic fuels powering existing fossil fuel plants’ would be a saner strategy. But what exactly that world looks like is in the details, and not critical to the broad point I was making.