Nope. Quite apart from anything else, there is too much wild speculation in this suggestion for it to be a valid interpretation of a Biblical passage.
It might not be quite so interesting to some as fallen angels, nephilim, aliens and UFOs, but the ‘deception’ warned about in the New Testament is to do with a corrupt Christianity.
2 Thess. 2 talks about a falling away coming before the Lord Jesus returns (v3). The falling away is a falling away from the Christianity the apostles established (cf. Paul’s words in Acts 20:30) — i.e., it results in a corrupted version of Christianity. This was to happen after Paul’s day but before Jesus returned (2 Thess. 2:3), and, by comparing much of Christianity today with the Christianity of the New Testament, sadly it’s safe to say that this falling away has already happened. In this context, the deception of v11-12 is to do with being deceived into believing the lie of this false Christianity over and against believing the truth of the gospel as proclaimed by the apostles.
For more on 2 Thess. 2, see The Greatest and Saddest Proof.