Yeah, it obviously is dependent on the AC itself. With that said, there's plenty of games that don't have many cheaters without kernel level AC. I've also heard that Valorant, at least in the past, had some significant issues with cheaters. Maybe that died down, but probably more because Valorant lost some popularity than the cheating issue was solved.

With that said, if you write your own AC on your own engine, it's always going to be better than using off-the-shelf AC on a publicly available engine. A big part of creating cheats is finding vulnerabilities. If it's a well known AC/engine, those are easier to find or already known and documented. Essentially every UE game for many years has hackers at launch, because the same ones work across multiple games, unless you take action to protect against them.

It isn't that Battleye or EAC are bad. They're just ubiquitous. Meanwhile Riot's AC are only in Valorant and LoL, which is a proprietary engine IIRC. That's why it'll have fewer cheaters, not because kernel-level AC is significantly better.