so would this kill off those $11 windows 10-11 Pro keys as well
As
@sswilson mentioned, not for now. I read about this on Tom's, and in that article, when talking about Win 10 - 11, they said, "Windows 10 users can still upgrade to Windows 11
for now."
Later in the article they said, "Windows Central tested whether Microsoft's new statement on the closure of the free installation path for Windows 7 and 8.X users had actually come into effect. In short, it found that "these older keys still activate the production builds of Windows 11." It's difficult to be certain how long this upgrade window will remain ajar in the wake of the recent official statement from Microsoft."
My sister recently got an older laptop given to her by a friend, and I installed Win 10 on it for her, and used the Win 7 key stuck on the bottom of the laptop, during the installation process, and it worked fine to activate Win 10. As mentioned above, there's no telling how long it will continue to work, though.....