Yes. I think that initially there was even official documentation from Microsoft for how to bypass the check, although I can't find that now, just "unofficial"

Yes. I think that initially there was even official documentation from Microsoft for how to bypass the check, although I can't find that now, just "unofficial" things like this https://learn.microsoft.com/en-us/answers/questions/2121461/install-windows-11-without-secure-boot-on-an-unsup https://learn.microsoft.com/en-us/answers/questions/2121461/.... (The top two comments have two different ways of bypassing the check: a command line flag for the installer and a registry change.)