I'm sorry but this seems a bit paranoid
They could say he was sent in a spaceship equipped with a temporal stasis pod, but have they? I don't know
The answer to the topic's question = me
Who is to say these are aliens in those UFOs. They could be time travelers, alternate dimension beings, or even people using secret military...
Perhaps it was more of a way to find a connection with you. He seems like a nice bloke.
Separate names with a comma.