I ran this script with the user 'robertba' (a sys admin who left some time ago) and got the following result

The row for user 'robertba' will be fixed by updating its login link to a login already in existence.

The number of orphaned users fixed by updating users was 1.

The number of orphaned users fixed by adding new logins and then updating users was 0.

However I still get the same error when I try to give 'robertba' access to the database.