1. Verify that the app is not anymore installed
Double check it is not installed by the APT system by running sudo apt purge tor
once more.
If apt
confirms it is not there, then search for remaining files from a possible manual installation. Search for a file with the name "start-tor-browser" on your system.
If such file exists, check the contents of the directory and delete it if it contains files of tor (including firefox, folders "browser", "defaults", "fonts", "icons")
If not, then
2. Find and remove the orphanned launcher
It may be the launcher only that is still residing on your system. Since the launcher calls "sh", the desktop still considers it a valid desktop file.
Search the launcher with the command
find / -name '*.desktop' -exec grep -H "Name=Tor Browser" {} \; 2>/dev/null
and delete the file (or move it away).