That's the official stance for declaring it EOL, yes. It always worked and works under Windows 11, having the same quirks as it had on W10.
The only problem is the Explorer.exe overload (that was fixed at some point and then likely unfixed with a later Windows update). But this also happens with version 6 (as discussed in the respective thread).
Perhaps this show that is has to do with something else entirely, but using, a software on incompatible OS could make it more difficult to narrow down the actual issue.
Thank you,
Basj,
Stardock Community Assistant