Oh, good grief. Total lunatic-fringe nonsense. Unfortunately for you, I have been intensely involved with the UFO phenomenon for almost 60 years. I know, to the extent it can be known, every nook and cranny of the UFO phenomenon and UFO research communtity since at least 1940. (I also had an encounter in 1971 that was highly anomalous but minor-league stuff as UFO encounters go.) There are and always have been credible researchers doing credible research. There are and always have been complete crackpots and charlatans.
The "UFO phenomenon" is in fact an ever-evolving, impossible-to-pin-down, multi-faceted set of diverse phenomena. There is no single theory that does justice to these phenomena. Some form of interaction with other dimensions is one plausible possibility. Some non-human intelligence manipulating humanity for reasons known only to itself (what Jacques Vallee called a "control system") is another. Extraterrestrials visiting planet earth is possible but could not begin to account for the sheer volume and diversity of the phenomena, which is why another suggestion is an "ultra-terrestrial" life form sharing the planet with us.
Angels and demons and other biblical stuff? Sure, this notion has always been around. One perspective is that biblical accounts such as Ezekiel's are in fact describing UFO encounters and have nothing to do with angels, demons or God. Another, more popular today, is that the UFO phenomena are in fact End Times manifestations from the angelic and/or demonic realms. I don't deny, this view is taken somewhat more seriously today than it was 25 years ago. To some researchers, this is simply evidence that the UFO phenomena are so perplexing that people must resort to things like demons in an effort to explain them.
The guys in your video are classic self-promoting whack jobs who have pieced together assorted tidbits of UFO lore, such as the Holloman AFB UFO landing (NOT), into a narrative that will appeal to paranoid conspiracy loons, Christian and otherwise, but will fail to cause so much as a ripple in the serious UFO community.
FWIW, these goofballs' entire scenario has its origins not in their own research but in author Nick Redfern's 2010 book
Final Events, in which he describes what he was told by supposed U.S. government "insiders." Nick churns out UFO books like a popcorn machine, and he makes clear in his comments here that he didn't take any of it seriously but was merely reporting what he had been told:
UFOs: WHAT THE HELL'S GOING ON?. Back in 2010 I suggested to his publisher that his supposed insiders were likely bored file clerks at the Department of Agriculture, whereupon I received back an email full of laughing emojis. Now the characters in your video insist IT'S ALL TRUE!!! Just another day in the wacky world of ufology.