> If you try to install a different operating system, your computer will not boot.
That does not follow. That would only very specifically happen when all of these are true:
1. Secure Boot cannot be disabled
2. You cannot provision your own Secure Boot keys
3. Your desired operating system is not signed by the computer's trusted Secure Boot keys
"Starting in a verified state and stay[ing] trusted over time" sounds more like using measured boot. Which is basically its own thing and most certainly does not preclude booting whatever OS you choose.
Although if your comment was meant in a cynical way rather than approaching things technically, than I don't think my reply helps much.
That does not follow. That would only very specifically happen when all of these are true:
1. Secure Boot cannot be disabled
2. You cannot provision your own Secure Boot keys
3. Your desired operating system is not signed by the computer's trusted Secure Boot keys
"Starting in a verified state and stay[ing] trusted over time" sounds more like using measured boot. Which is basically its own thing and most certainly does not preclude booting whatever OS you choose.
Although if your comment was meant in a cynical way rather than approaching things technically, than I don't think my reply helps much.