I think Loeb's meta-argument is that the peer-review process is tilted towards discounting arguments that include the possibility of extraterrestrial life. You can't really have discussions about how the peer-review process should work within the peer-review process. And moreover, since society at large is
providing the resources for our science, they should have some visibility and input into how those resources are spent. I say this as a scientist who generally thinks (at least my field's) peer review works pretty well, so to be clear I'm not saying this to discount expert opinion.
You can feel free to disagree with Loeb's points, but I dislike the characterization that some part of this process is "invalid" (bullying) or that communicating with the public is similarly invalid because it "steps around peer review". Even your comments disagreeing with Loeb's approach are part of the process by which science and society make progress, I just happen to disagree with them in this case.