Yeah, I feel like I'm misunderstanding something, or what he said?
I mean, I believe the does might start cycling around then, but not many. I believe lots of bucks might start increasing movement or moving territory around then. But if he is classifying peak rut as the time when the most does are coming into estrus and therefore the most bucks are aggressively trying to get their peter wet, those are the not the dates that come to mind.
If he's using some other metric, I'd be curious to know what that is. To my knowledge does only come into estrus for like 24 hrs, so if a bunch of does were coming into estrus that early, I'd find it incredibly hard to believe that the bucks were oblivious to that. I was in the badlands this year on Nov 7th and all the mature bucks were sitting by themselves, showing zero interest in breeding. Little forked horns were starting to show, but they don't know what's going on. That is consistent with what I see on a year to year basis.
Obviously, there are exceptions but...I dunno...I'm scratching my head on what he was talking about.