Secure boot can largely be turned off at least for now, and TPM is mostly a passive thing, but the seriously real threat to freedom is remote attestation --- unlike the others, it's something that you can't get around by "simply" building your own platform, by design. External entities will have the power to compel "your" computer to do what they want, or else you will be denied access to many services. Unless we act quickly to fight against it, this will be the beginning of an authoritarian dystopia unlike anything we've seen in the past.
You can already see attempts at dissolving the rebellion against RA by Big Tech and the propaganda they disseminate. They don't want people to know this until it's too late. This warning should be taken in the same way as Stallman's "Right to Read".
True, but it seems it is still another example of cat and mouse game ( for example, unRaid seems to be able to run Win11 with TPM ). I am not suggesting that the issue you raise is unfounded, but at least for now as many people are working to make it a reality as ones, who do not.