So it actually worked on 20H2 but the system just doesn't undo everything. For me atleast.
In the video they used regedit to load hive the registry and put it back to setup mode to get it to run the lifesaver.bat
Let's undo those manual changes if they couldn't be undone by the script.
regedit
Select HKEY_LOCAL_MACHINE
Go to File - Load Hive
C:\Windows\System32\Config\System
Give it a name SYS is fine again
Expand HKEY_LOCAL_MACHINE\sys\setup
The script was to change the computer back to normal mode.
SystemSetupInProgress
SystemType
SystemPhase
to 0
And blank CMDLine
Mine the SystemPhase was stuck at 3. Once I changed it back to 0. Select the SYS key and File - Unload Hive. Rebooted and windows started normally to the logon page.
Logged on with Andrew.
The 'net user /delete userid' did delete my account and profile. I hope you didn't have anything stored in your profile that you needed.
AamazingTech2