Yes, and like most “debunkings,” it’s a very mixed bag. Their take on the most remarkable painting of the collection, for instance, is a bit of a stretch:
http://www.sprezzatura.it/Arte/Arte_UFO_3.htm
Sadly, there’s no english version of that one. They appear to be implying that the round, disk-shaped object that’s aiming four beams at the ground is actually an iconic image of a bird. If so, the bird is about 1/20th of the size it is in the other examples they provide. Further, they only provide two, and both have many additional details to distinguish them from the object in the baptism painting.
No doubt, a lot of the “UFO art” is a stretch—“hey! that’s round! it’s an alien craft!”—but there’s also some seriously weird evidence that’s much harder to dismiss, and that baptism painting is at the top of the list, for me.
Just the same, if I can find a more English version of that material, I will definitely link to it in the library.