We recently banned a cluster of ChatGPT accounts originating in Russia

We banned a cluster of ChatGPT accounts that very likely originated in Russia.

Methinks AI helped write this. Although…their evidence is pretty damning.

Seems pretty normal to me. Your first sentence is taken from the abstract, a short summary of the article as a whole, so details are excluded or glossed over. Your second sentence is from a section titled "Actor", which goes into actual detail on who the actors were and so has more fluff like this. They go on to explain their reasoning in that section -- you can't actually create an account from Russia itself, but a VPN can be used to bypass the block, which lends some uncertainty. They then proceed to systematically eliminate that uncertainty by showing how the accounts were acting.