What exactly do you feel his expert qualifications are? He's certainly not a highly respected naval aviator the way Fravor is. Nor is he an expert on the space, sky and sea sensor systems that are capturing these incidents, the details and output of which in many cases are still classified.By the guy in the video I linked, stupid. He's an expert.
I suppose it's possible the DoD is lying that it has accumulated too many measurements it can't explain to ignore. But the guy in the video doesn't even have the full measurements at all. He doesn't even fully engage with the much more basic topics of how multiple aviators could fail to ID a bird or balloon from visual range, nor be incompetent to describe (unusual) sea surface conditions, nor be fooled into thinking they are being engaged with in mirroring maneuvers at jet speed.
But he is convincing that you can only tell so much from a single grainy video from a single flight system. Of course if that's all there was we wouldn't even be having these discussions in the first place. Nor would we be seeing a former director of national intelligence saying he was concerned about airspace incursions that were probably just birds or balloons.