Reddit is so over moderated and the mods don't give a shit at all about their communities, just their power over those communities and reddit as a whole. Then you have how awful the auto moderator, the report system, and the reddit cares bullshit, it's basically an over moderated safe space for MAGAs/Nazis, Sealioners, and concern trolls.
I wouldn't be surprised if that UK definition has something to do with the name since it's usually Nazis or Nazi adjacent fuckers doing the sealioning.