I know almost nothing about hunting, but I've spent more than my fair share of time in a MOPP suit and NBC (now known as CBRN) training. The army isn't trying to control scent with MOPP suits, they are trying to protect you from chemical weapons. Claiming a MOPP suit can control body odor because it can protect you (sort of, we'll get to that) from mustard gas is making a leap of logic without filling in some pretty important gaps. The carbon in the suit is only one half of the Chemistry that kind of goes like this
1: Carbon likes to react with and trap stuff and prevent it from reacting with other stuff. It cannot react with everything though.
2: Chemical weapons, in general, are HIGHLY reactive substances. They just super want to react with anything they touch. The carbon is more than happy to oblige before the chemical can get to you.
This means the reactivity to the molecule you want the carbon to catch is a full half of the puzzle. Do the molecules we give off bond to carbon? I don't know. Probably. But don't mistake the intention behind the Army's use of the MOPP suit. They don't care if anyone can smell you, they're trying to prevent your skin from melting off. Those two things are not intrinsically related.
Secondly, MOPP suits are a very poor form of defense against chemical attacks, it's just better than no defense at all. The idea is to basically allow you to get the heck out of dodge, or to move through an area where an attack may have occurred previously and is still some level of contaminated and get back to the guys with the real gear to get deconned there (The guys in the yellow boot suits https://www.youtube.com/watch?v=SzX7pmQHSwI
Anecdotally I've been stuck in a Humvee with four other guys in MOPP 2 (Full suit, no mask or gloves) and it sure didn't seem like anything was helping to cut that stink. I'm even pretty sure I remember the suits themselves stinking pretty bad once we got the all clear to pull them off. I've also noticed that MOPP suits that have been worn into CS chambers retain the smell of CS gas and contact with them can cause slight burning and irritation. To me that suggests that the carbon is not locking all the CS down, or is releasing it (otherwise I couldn't smell it) and is definitely releasing it on contact with skin.