It sounds to me like claiming that all old Windows versions will be unbootable is an overstatement. Rather, it's most likely the case that you won't be able to boot old media when Secure Boot is ...

Prospective Battlefield 6 closed beta players are running into a unique PC error when trying to launch the closed beta client: “Secure Boot is not enabled ...

To play Battlefield 6 and Call of Duty: Black Ops 7 on PC, you need to enable Secure Boot. This provides developers with features that make it harder for hackers to use kernel-level cheats, memory ...

A new Steam beta update is making it easier for gamers to check the status of Secure Boot and TPM on their gaming PC, must-have requirements for anti-cheat in plenty ...

I only know that secure boot is a feature that checks the system bootloader is properly signed by something/somebody authorized to do so. So it would make sense that ...