And as far as I can tell they just arbitrarily claim that without evidence. The way they say it also makes it sound like a partial list of blocked languages, based on former USSR countries like Syria.
I'm saying they provide no evidence for the claim. They spend a long time going over what is in the config, which they link to, then just say "and they don't target these languages."
Your links supposed anonymous forum post is better evidence, though it's only evidence on the Syria claim is an unlinked announcement and the actions of a group they guess is related.