Yeah, influenza type B 'Yamagata' has been mostly gone since 2020, but that's not necessarily because of COVID, but just because the virus is so variable. In fact, it's highly unlikely for an influenza sub-type to hang around for more than 18 months.

In Europe, for 2024/2025, types A 'Victoria' and 'Thailand' (with type-B 'Victoria' and 'Yamagata' following closely, so you can see it's still there-ish) are expected to be the most virulent. but, as always with influenza, this might be wrong, which means vaccination might be slightly less effective, although still beneficial.