Fun creative writing exercise for sure. It's given away by the fact that the writer isn't American though. A couple of britishisms come through (op might not be british, but either way it's british english) which just makes it really obvious that it's fake.

Also the story kinda falls apart if you think about it. They can't prove who they are because they're scared of retaliation from the government (the government which is largely in the dark about aliens, mind) but they can babble all day and night about extremely specific details about the aliens?