1. It looks bad.
Not if you realize there is actually an eight man crew, and this is just one more crew member getting information to the R. The mistake here was the R dropping the flag without first glancing to the AO to see if the ball crossed the LOS.
2. There is already a review process in place.
True, but this didn't circumvent that.
3. The AO came onto the field of play.
I'm GUESSING it was only because he couldn't get the R's attention. This was a call that involved the LOS, the R should have looked to him.
4. I've never seen this before and it caught me by surprise. Has this process been publicized like the booth review process has?
Ah, now we get to the issue, it's new to you! Publicized? I don't know, but anyone working in the SEC knows the AO has two major duties, the clock and calls regarding the LOS. This one got more visibility because the R dropped his flag without checking with the AO first.
Think of it like an intentional grounding call from the pocket. That's a flag that often takes coordination between the R and the wings. The R knows if the QB "dumped" the ball, but he often has to get information from the wings as to whether there was an eligible receiver in the area, as he is watching play with the QB and not looking downfield.
So, is it better to drop the flag first, then check with the wings and pick it up if need be, or check with the wings and then drop the flag? That is a debated mechanic and I'm not sure there is a clear answer for all plays.
I'll concede 'highly improper' is too strong of a phrase in this case.
It wasn't improper at all, just not as clean as it should have been. "Blame" the R.