This is the belief of L.A. Marzulli, Dr Chuck Missler, Tom Horn, Cris Putnam, Guy Malone, and largely, essentially Dr J Allen Hynek and Dr Jacques Vallee agree that these entities, critters, are evil spiritual entities that come from an evil spiritual dimension.
The powers that be have been carefully, gradually brainwashing the global citizens to believe they are ET's from at least the time of the radio experiment WAR OF THE WORLDS. And it was a carefully constructed experiment with significant oligarchy involvement.
All the major sci fi movies have similarly continued and refined the brainwashing in a variety of ways.
Christ warned that the GREAT DECEPTION of the end times would be so great that were it possible, even the Believers would be deceived.
Secular man has forsaken the authentic Almighty God Yehovah. But they are desperate for a savior so the enemy is happy to provide ET pretenders to fill the bill--probably as good cop/bad cop--some playing one role and some playing the other role.
And the charade and the band will play on.
I think you have misinterpreted Hynek and Vallee somewhat; but thanks anyway.