His conclusion re: UFOs (that they are related to the angelic/spiritual realm) makes a lot of sense.
I bought a copy and read it last year. I thought it was great. I've also listened to numerous podcasts, both his own and shows where he was a guest. He always had something informative to say.
Yes, it makes sense. He will be missed. I think the goal of the so called UFOs, is deception. Jesus said, take heed, that no one deceives you.
From your description, I believe I agree with him. I’m not a scholar, but I am a Christian. I’ve always felt that UFO’s were associated with demonic activity for the sole reason that Satan will use any device to distract from, or offer alternatives to God.
In other words, he is like a magician calling attention to something shiny so you won’t look at what’s really going on.
If Satan can get an unbeliever constructing an alternate reality to the one God has revealed, that person may never acknowledge God/Jesus.