[jauntywundrkind]

You can set BandModifier2_4GHz=0.01 to make 2.4GHz 1/100th as preferred in the excellent excellent iwd daemon (or 0 for disable).

https://man.archlinux.org/man/iwd.config.5.en#Rank

[yjftsjthsd-h]

Oh that's clever - not disabling/forcing it outright, but preferring one frequency over the other(s).