That's not a real hard stop at all. I successfully installed it through legacy boot via bootcamp on an old iMac 27 2011. It worked flawlessly. I upgraded from W10 and used the tutorial in the Youtube channel Macintosh Men. Later it was found out that you can easily bypass the artificial requirements by a setup /product server command. Link: https://www.pcworld.com/article/2103104/windows-11-simple-trick-bypasses-cpu-tpm-lockout.htmlThe TPM 2.0 hard requirement means it won't be available for Intel Macs (unless you are virtualizing, of course).
Big Corp. with huge numbers of Windows clients couldn't migrate to W11 ready PC's in just a swoop so MS had to leave doors open so that Big Corp. could stay compatible. My combo of a legacy boot, old processor and no TPM at all works just fine. The requirements are all artificial for now. If it works with W10, W11 will work in reality.