I'm pretty sure SD knows it isn't compatible with Rectify11. Its compatibility is with actual W10 and W11.
Rectify11 is a "rebuilt" W11 removing XP remnants if (memory serves).
Fences was designed to work with the actual Windows11, etc., not "rebuilt" W11, which is not the OS MS released. Fences also doesn't work with MacOS, Linux, etc.
From Stardock's Fences:
- System Requirements: Windows 10/11