They had a version of PC Health Check, didn't work too well and they pulled it down.
Then they put out this version which seems to throw a random error now and then.
Why not try a third party tool and see if that sorts out anything
Detection Script to help identify why your PC is not Windows 11 Release Ready. Now Supporting Update Checks! - GitHub - rcmaehl/WhyNotWin11: Detection Script to help identify why your PC is not Win...
github.com
Seems to me, if the message you are receiving is inaccurate and you know it to be so, then....
All else being good to go (hardware wise and a known good system image) I'd proceed with the install / upgrade.
Are you saying that this error is halting the upgrade procedure??