Maybe this link helps:
https://blogs.windows.com/windowsexp...on-innovation/
That is the original post by microsoft. If I understand that correctly, than you could use new processors with win 7, but without using the new features of the processors. It could be even slower than using an older one. A limited number of devices with win 7 will receive updates to use the new features, so if a company wants newer hardware and win 7,they could buy these devices. But these devices would mybe not receive all updates for new features, if the updates would harm normal win 7 computers.