Not if your (U)EFI firmware is capable of booting BIOS-booted operating systems as well as (U)EFI operating systems (like IBM System x Server Firmware).
So they appear to be moving over to "not being IBM PC compatible". Which is perfectly valid.
I never said that PCs are called PCs because they ARE IBM PC compatible, only said they are called PCs because in the past "IBM PC compatible" defined their category.