Correct, sort of. Unity will not work on Windows 8.1 starting with Unity 2023.1. However:
- According to our data, there are almost no people using Windows 8 & 8.1;
- Due to point 1, several years ago we stopped testing Windows 8 & 8.1 and dropped it from Windows Editor supported OS list (our system requirements for Unity 2022.2 say: “Windows 7 (SP1+), Windows 10 and Windows 11, 64-bit versions only.”). So technically, it was already not supported but I don’t think we actually had any bugs reported relating to it (and it probably works just fine due to Microsoft’s excellent backwards compatibility).