I think it's just wanting people to buy new computers. I have an Intel 7th gen CPU that I got a couple years ago that works perfectly well (except for specter) and it's too old of a CPU model to upgrade. 8th generation and newer are compatible though. You are able to install Windows 11 on older computers but I don't think you get Windows Update and it isn't really supported.
I think it's just wanting people to buy new computers. I have an Intel 7th gen CPU that I got a couple years ago that works perfectly well (except for specter) and it's too old of a CPU model to upgrade. 8th generation and newer are compatible though. You are able to install Windows 11 on older computers but I don't think you get Windows Update and it isn't really supported.