How to delete App (files with cross sign) that cant delete from Application on Mac
Solution 1:
The prohibitory symbol means the application will not run on your machine.
I'd recommend either user128733 or CousinCocaine approach as seen here:
How to remove an icon from launchpad that does not appear in the Finder?
Application cleaner tend to be OK. FYI: General mac cleaners are to be avoided.
https://nektony.com/how-to/delete-apps-from-launchpad