I'd be more interested if people outside the community -- people who don't have a stake in it -- would work on it, but for this discussion, whether it's bro science or not doesn't really matter, as long as it works for people. (Until someone discovers long-time ill effects, of course, but I'm not aware of that right now)
Although I do guess that the "sole true human diet" factor is contributing to the effectiveness, as people who accept that are more likely to stick with it.
I'm sure some see 'paleo' as pseudoscience, but there are definitely people in the community trying to pin down the science.