it wouldnt be a ban, you would just get your stats reset... but first of all it would be impossible for them to scroll through the leaderboards and find all the people who used the prestige hack, so most likely he is referring to the leaderboard hackers because they are fairly easy to spot (people like Mike Canzez, who obviously has some major insecurity problems to want to spend all his time filling up pages upon pages of the leaderboards with his accounts) also, if you have a remotely high amount of kills and score, say 40,000+ kills and 3 mil+ score, then wont even suspect foul play.
but i actually do hope they patch the exploits soon, as i want my main account back in the top 100 where it should be