Yes, that is the same link I posted above- and if you read the reviews on that page - they say similar complaints as yours.
Looks hijacked, to me.
One of the comments gives what he says fixed for him:
Doesn't work on Debian 10 with Gnome 3.30.2, the system crashed into a loop at the login screen, I had to enter with CLI/TTY and went to ~/.local/share/gnome-shell/extensions and remove your extension, then rebooted the system and everything got back to normal...
cfmarco said a different but similar solution worked for him (both solutions should work)
It additionally crashed the system, produced an infinite loop when trying to login which didn't work. Had to open terminal at login (ctrl+alt+F3), disable all extensions (gsettings set org.gnome.shell disable-user-extensions true), and first then could I log in and uninstall this extension. Afterward, you just enable extensions again and everything works (gsettings set org.gnome.shell disable-user-extensions false).