There will always be dodges like these - we didn't refer to "Weed" as weed when discussing it on pay phones in the dorms in the 1980s because we knew those phone lines were being listened in on.

It's very similar to that.

Once they pick up on the words though - they can shut the groups down (obviously).

I think if you stumble across that - the best you can do is report it. But remember FB is down it's usual full slate of personnel right now and isn't scanning posts as well as it was prior to this pandemic.

I just watched a meme group slap up it's rules as the main photo of the group to cut down on the crap that was getting posted because the moderators were getting overwhelmed by it. Normally FB pulls some of the burden of people reporting posts - right now you're getting a "Due to the Covid-19 virus we're too busy" line back from reporting general stuff.

So if you have people of a similar mindset trying to get away with something with a decent amount of "clever" between them - they can get away with it for a bit - until someone wanders in and reports them.

I've wandered into some pretty bizarre groups on FB and wandered right on back out again.
Things that pretend to be militias that don't seem particularly harmful - but that with the wording they use? Who the hell knows!
Report it and walk back out. Usually blocking the group behind you on the way out because "Gees they're pretty well nuts and they have weapons".