I am not sure what the at-scale energy use reduction of this bug fix will be, but...
If I had a pile of money I would consider creating a special bug bounty style program for energy use reduction.
This might be a very efficient way to reduce carbon output from personal and data center computing.
This can be a dangerous objective. There are already changes going into Windows 10+ regarding the OS scheduler [0]. Windows 11 is also noted as having an even more aggressive policy. How much longer before old games stop working correctly and we have to have MS-signed binaries to get 1ms timer resolution?
Obviously, we don't want to poll aggressively whenever we can avoid it, but there are also a lot of practical UX & technological reasons to have this capability.
[0]: https://learn.microsoft.com/en-us/windows/win32/api/timeapi/...