Rennur wroteLoggedInEmployee can be a 'Calculated' attribute.
CORRECTION:
ProjectApprovalStatusNote.AddedBy can be a 'Calculated' attribute.
So, I revised with .ID, below, and still lets anyone delete:
IF ProjectApprovalStatusNote.AddedBy.ID<>LoggedInEmployee.ID then PROTECT ProjectApprovalStatusNote FROM ALL EXCEPT Administrator
I even have a Process that displays these IDs, and they are indeed different. Both users are access level Customer (not Administrator), so this IF statement should work, but does not.