Very true and that's why it is odd that microcode has been mentioned here. Surely they mean PCU software (Pcode), or code for whatever they are calling the PCU these days.
Well, do they? The operating system can provide microcode updates to a running CPU. Can the operating system patch the PCU, too?
When I look at a "BIOS update" it usually seems to include UEFI, peripheral option ROMs, ME updates, and microcode. So if the PCU is getting patched I would think of it as a BIOS update. I think the ergonomics will be indistinguishable for end users.
