This isn't correct. Yes, Microsoft is notorious about changing their mind, and no one will be surprised if they do that, but so far they've been clear & explicit. They've said that TPM 2.0 is required but not enforced in the preview build. They've said that older CPUs can be upgraded to a preview build but will need to be reset to a clear Win10 install on the release on Windows 11. In their first update after the community backlash they specifically stated that some 7th generation CPUs may get support but "We also know that devices running on Intel 6th generation and AMD pre-Zen will not" (linked here). That means no ongoing updates or LTS support. Don't shoot the Messenger.

As to your question "If you don't want to be forced to upgrade a 5 year old computer now, will you be more receptive to the idea once it's 10 years old?"... er, yes? Wouldn't anyone be more likely to upgrade or replace a 10 year old computer? Even in the enterprise environment, we know we can't keep them forever.