He would definitely be banned if he was actively bragging about fucking girls at the present. This should be common sense.
If I were to rank a hierarchy of bragging I would put it like this:
1) Bragging about actively currently being sexually successful - MAJOR problem. This is an incel site, and that by definition excludes you from the conversation if you intentionally make it widely known.
2) Bragging about a past history of sexual success - MODERATE problem. People should have enough respect and decency for others in the community not to do this. But having had sex once 20 years ago for example doesn't mean you can't be an incel now, so I don't consider it disqualifying in the same way unless it's intentional, gratuitous, and repeated despite warnings. Normies can become incel due to many factors like getting older, fatter, uglier, or dating just becoming harder. See my sig for an example of what's happened to ethnic men and their celibacy rates in the past 15 years. No doubt many ethnic normies have now become ethnic incels. If a past history of sex is disqualifying from participating on the site, this site would then effectively be a "virgins only" site, and although most virgins are incels, that's not actually what "incel" means. You don't have to be a virgin to be an incel.
3) Bragging about a positive attribute - MILD-MODERATE problem. People don't come on here to feel inferior. We already feel inferior enough. So no one wants someone coming on here bragging about how incredibly handsome/tall/ripped/brilliant/rich they are constantly. If it's just a passing mention no big deal. But if you're trying to rub it in everyone's face every chance you get, then yeah we have a problem.
4) "Bragging" about minimal things - MINIMAL problem. eg. having female friends, getting a few matches on Tinder, a girl talking to you once, etc. I call this "bragging" because I don't even really consider it bragging, since none of it implies you aren't an incel or are trying to make other people feel bad by mentioning it. Someone mentioned for example that fukmylyf had claimed a girl came up to him and talked to him once on looksmax.org. Who gives a shit? If you're an autistic male, for example, is that gonna stop you from being incel? Obviously not. She'll figure out your autism in 1 minute and that will be it. This type of minor stuff is only a problem if people are being very petty or intentionally making comments to bait other users. And then it is really more of a "bait" problem than a "brag" problem.