Hi there!
so this is interesting, because it should actually be the other way around, by default Rocky Linux 9 installs the kernel package which is 4k, which is also the thing Fusion on macOS needs to be able to run.
If a system needs the 64k kernel you explicitly have to activate that in the kickstart file: Performing an advanced RHEL 9 installation Red Hat Enterprise Linux 9 | Red Hat Customer Portal