That's a great idea. I think it would probably work, but I can think of one potential case where it would introduce some complications.
If user1 sees 'pg' as the submitter and user2 sees 'blah' user1 might comment something which gives away that it is actually pg to user2. Now user2 might realize this and act on their pg bias.
If user1 sees 'pg' as the submitter and user2 sees 'blah' user1 might comment something which gives away that it is actually pg to user2. Now user2 might realize this and act on their pg bias.
Can you think of a way to prevent this?