Unwarranted snark.

Unless there's any good reason to suspect otherwise, why not go with the "this is an italian poster, which is why they are writing in italian", as opposed to a multi-ligual person using a non-native language in a false flag operation.

Especially since genuine loonies posting such BS is quite common in forums, comment sections, and newsgroups and we all have seen examples.

Ever heard of Occam's razor?