Oh I am aware of the term's history[1], but just like the humble swastika some stuff can become tainted (although I believe that Ultima Thule the band is only locally infamous here in Sweden). I do know that if someone presented themselves as Ultima Thule I'd do a spit-take, but so would I if I was presented by someone named Titan Invictus.

Arrokoth is a fucking metal name tho.

[1] pretty sure the first I heard of it was in one of Evan S Connell's great collection of essays.