Idk why.
You cant tag what you don't see, that's why.
So you agree it's unfair and unreliable?
Only few of them have been tagged by him, I saw many others not being tagged -snip-
So it wouldn't be reliable neither fair to rely on that.
Then you should've archived them. So you can prove what you saw and help the campaign manager or the others.
Why I would do that?

I'm not a moderator and I'm not here to try to replace them.