Oh, and it could be that you can get a refund anyways, but it might be, that they would contact the developer first. And since people are complaining a lot again about not being indexed, it stands to reason, that there are delays.
Technically, just because they say something is the prerequisite for an action, does in practical terms not mean, that this is always enforced.
I do not know how itch handles multiple refunds from the same account. But I do know that Steam will block your ability to request refunds, if you refund too much.