Is it correct to say that the one thing the extraterrestrials don’t have is wisdom, and that the divine realm is a mystery to them?

Both are true. The lack of wisdom is from being so disconnected from the divine realm. They have lost any of the understanding and the divine precepts that were gifted to them in the very beginning. This, as you know, was because of corruption by the spirit meddlers to darken them, to take them out of alignment and make them disenchanted, seeing only negativity and feeling a distancing from the divine that became quite profound. This has reached a quite extreme state.