Is this form of Gatekeeping valid
In our local community, there's an individual who plays Custodes solely because they are gold and are overpowered in lore, expecting that to correspond to the tabletop. Only for him to find out that they are not OP and get destroyed by players who know how to counter or play against Custodes. This person then proceeds to quit the hobby and accused the players he lost against as cheaters. When he wants to sell his army, he would sell them at scalper price and consider it valid because custodes are high value. When I played with him against my World Eaters I'm surprised that his Custodes got 4+ feel no pain on all units, got sustained hits, lethal hits and dev wounds and both shooting and melee. Whenever he gets called out he assures everyone that he "READ" the entire Custodes Codex time and time again. After a couple of games, me and my friend read both 9th and 10th ed Codex of Custodes only to find out that his army was NEVER that strong. Whenever we confront him he'll just say we're just salty losers and questions our choices for choosing ANYTHING other than Custodes.
After his departure from the warhammer hobby, the guy proceeded to play with other hobbies primarily TCGs. And after a few months or close to a year he decided to return to the hobby. Coincidentally enough, there were talks with real evidence of him being toxic and cheating on every hobby that he touches. And whenever he gets caught, it's always the same "The community is toxic, so many cheaters." bullshit excuse. I had multiple discussion with people I am close with in the local Warhammer community that I'm in to tell other people about his antics and at best "Ban" him from the community so that he won't bring his toxicity into the hobby. He is the type of guy that views others as peasants and only thinks of himself. And I badly want him OUT of the community cuz his presence is enough to make the community uncomfortable. But yeahh my friend group is still unsure if whether gatekeeping is the best option.
Any thoughts about this situation? Cuz people have been inactive just because of him existing xD