At the bottom of the page you can find a search bar with which you can discover that David Grusch's claims and the UAP phenomenon in general have been done to death here.

There is no real discussion to be had on the topic. People choose to believe Grusch and others because of their own faith in the ET/UFO narrative as a first principle. People doubt Grusch and others because none of them ever present compelling evidence, and their claims in aggregate are ridiculous. The former camp mocks the latter camp, the latter camp mocks the former. Eventually the discussion splinters into talk of Von Neumann probes, generation ships and the Fermi Paradox. Lather, rinse repeat.

But here we all are still waiting for the "catastrophic disclosure" that should have happened by now. And for what it's worth the government's own investigations have consistently come to the conclusion that no extraterrestrial or physics-defying technologies are involved, and the vast majority of what's been presented as undeniable proof via video and photographic evidence turns out to have mundane explanations. But of course one can simply write that conclusion off as part of the conspiracy.

So yeah. Let us know when there's a there there.