Steam now lets you check if you have Secure Boot enabled: the security feature we're all going to have to get to grips with for Battlefield, Call of Duty and more

Steam now offers a quick way to check if your PC has Secure Boot enabled. That's probably not information you care to fill ...
Rock Paper Shotgun

Steam's latest beta lets you easily check if you have Secure Boot enabled before firing up Battlefield 6 or Call of Duty

Steam's latest client beta adds whether your PC has Secure Boot enabled to the list of system info you can pull up in the app ...
Ars Technica

Microsoft patches Secure Boot flaw, but won’t enable fix by default until early 2024

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 ...