I’m guessing that - from my experience of the CasualUK community when I used to be on Reddit - they have similar rules of ABSOLUTELY no politics. Even something that might lead to politics.
It’s to keep the place extremely light hearted and not turn into a depressing news/politics community.

So immigration/border policy and Palestine Action would both be out.
Even jokes about small boats would likely be too close.

It is a fun story, glad you shared it. And good on the mods recommending an alternative community