I've seen them and blocked them immediately. It's a couple of sad losers posting news (or "news") articles. I'm one of the more vocal supporters of defederating that one instance since they've openly become a bigoted shithole and their mods are in favor of keeping it that way, but this? If T_D showed up on a different instance I'd be generally in favor of that instance banning that community and nipping the problem in the bud (Trumpers have been fine with sitting at a table with Nazis for a while) but I wouldn't be supporting defederaton over a couple of assholes on an otherwise decent instance. Assuming they're not bots, they'll probably get themselves banned soon enough for being awful if we've got enough mods here that can keep a close eye on them, and maybe just using the current rules the moment they start to be openly bigoted is the right play here.
I know the mod tools on Lemmy aren't terribly robust, but are other instances able to block individual communities without defederaton? I would like to believe T_D is a temporary problem here and I think it'd be interesting to see if the current set of rules take out the trash in a timely manner, or if they just fester while building a critical mass before infecting the whole instance.