Not really. The GP is implying that they are Russian with this

>since they can't just say "I work for Russia and we're reminding America that they're not invulnerable."

But the person who replied is saying how the grammatical obfuscation doesn't look like something that's done by a Russian but by an English speaker who is trying to sound like a Russian with bad English. Because a Russian with bad English wouldn't make those mistakes.

Well, there's no Russian first-language bias in that text for sure. Another argument in favor of the opinion that this was written by an American: the author seems to be well versed in the memes of the US political discourse. Someone from outside the US is unlikely to even know or care about Trump's "movement", or who "Bannon" is, or "drain the swamp", or "white privilege" etc. They're also unlikely to abbreviate "New York Times" as "NYT". The telltale signs are all over the text.