This guy refers to anything that is beyond hsi personal knowledge as demon related.
Lately the U.S. government has admitted that UFOs are real, but the origins are not known.
Personally, I think it is more likely that beings travel between universes (multi-verse theory), than it is they travel from other solar systems. I imagine a universe where Christians didn't burn the library of Alexandria and suppress knowledge for over 1,000 years (the dark ages), and their science advanced to such a degree that they could travel the multi-verse in what we have come to know as UFOs.
Just one possibility which I see as more likely than "demons".
Something did crash in Roswell. In fact, several somethings. As we spied on Russia using high flying weather balloons, some of them even equipped with manikins, the debris of one was found on a ranch. This put the secrecy of the project at risk as it went public and the UFO story was born. Immediately we have to fuel this and also talk "cover up" at the same time. Stories have grown and grown worldwide since then. It is a perfect cover. It would be damned near impossible to test anything secretly and expect it would not be seen or photographed by others. In the aftermath some people have even been flown to other worlds in the flying saucers. LOL
The Pentagon has admitted (again after 1952) that UFO's are real, physical, structured craft. They have admitted that the craft are NOT ours, and all reports are that they are not controlled by the Russians nor by the Chinese. Indeed, the technology appears to be many decades or centuries ahead of jets or rockets. In large measure, the recent disclosure was made to note the change in policy to stop ridiculing and gaslighting those who witness such craft. Debunkers who enjoy using snarky derisive language should take the hint.
AATIP's Luis Elizondo wanted to brief John Brennan on what he learned about UFO's but was denied permission. When Elizondo asked about the decision, the senior officer asked if Elizondo read his Bible. Elizondo inquired further and the senior officer opined that UFO's were demonic spirits.
So a major national security issue can be hamstrung because religious wackos are treated like everyone else...
I imagine that anything in the sky we can't explain, is probably a DARPA black project (or Chinese/Russian equivalent) that the rest of the military doesn't know about, and the pilots are buzzing their colleagues to see how the technology stands up under real-world conditions.
Why aliens stay out of sight as much as they can!