This is kind of a WTF? moment for me, and apparently a lot of others. The big WTF though is Paola Harris? Huh?
Vallee has done far more field work than most of his contemporaries, critics, fans like me, and pretty much anybody else. I don't believe he ever said the craft (or for that matter their occupants) were anything but physically real. It's the how-they-got-here part that causes all the trouble. I believe in the end that question is moot. They are here, from somewhere else, which makes them aliens. Obviously they can manipulate our physical reality at least as well as we can. Maybe being physical in the sense that humans are physical is not their native state, but I think the same is true of all of us.
It looks to me like Vallee sees physical proof of alien presence is within reach. Of course he will see if it really is, if he can. There seems to be a significant change in his rhetoric, and certainly in his approach just now. It will be interesting to see where it ends up. I'm sure he doesn't care what anyone thinks of his choices or actions at this point. If there is anyone in the field with nothing to prove (in the sense of being credible), it would be Vallee. Of course he is old enough to be suffering from some sort of dementia, or maybe he has lost his marbles.