It is claimed that the Feature Updates will not occur automatically, but since I did the 23H2 update manually on all my hardware, compatible and incompatible, I have no idea if that's true.
I can definitely say that incompatible hardware has been getting the same "non-feature" updates as my supported hardware has been.
It would be so nice if Microsoft actually meant what they said, at all times. This entire topic would have been unnecessary if what they said was consistent and could be trusted. But since what was supposed to be the end of the free update period to Windows 10 in July 2016, which never was the end, and where multiple "it's the end" announcements for ends that weren't have been made, we have to rely on what we hear about what's actually happening in practice to know what's going on.