I read the whole thing, unfortunately. She doesn’t explain anything. I have no idea what she thinks they are.
She doesn't know what they are. She does mention that it "appears" that they are not "aliens" in the classical sense. Whatever they are (and I don't think anyone knows at this point), they appear to be related to the paranormal or occult (as much as they want to be perceived as "aliens" flying around in nuts and bolts craft).
I read Pasulka's book American Cosmic and am currently reading her new book, Encounters: Experiences with Nonhuman Intelligences.
A great place to start is this book:
https://www.amazon.com/Flying-Saucers-Modern-Things-Skies/dp/0691018227
That's the gimmick; you have to buy the book. In carnival slang, it's called "drawing the tip" (attracting a crowd of people to buy tickets to the sideshow).