I wouldn’t be so sure.
If the chip is licensed to OEM’s who are contractually required to install only Windows on systems built around this chip then any systems built with the chip will only load Windows and there is nothing you can do about it. UEFI, Secure Boot, and Trusted Platform Module, together make it possible.
If the chip is licensed to OEM’s who are not contractually required to install only Windows on systems built with the chip, then other OSs can be installed
The capability exists, what is available depends on Microsoft’s & Intel’s licenses and contracts between themselves and system builders (HP, Dell, etc).