Dammit people, what the hell are you doing ?

OK, so following up on the earlier post, here's another claim of galaxy satellite planes that frankly borders on just plain silly. The Milky Way plane of satellites is definite. The M31 plane looks to be marginal. The other major claim is that there are two planes in the Centaurus A group, shown below (data from https://arxiv.org/abs/1503.05599).

But this one looks to be completely mad. Viewed without colour coding, it looks for all the world like an isotropic halo with small number statistics. So how do they decide which ones are members of the two planes (red and blue; green indicates no plane membership) ? Apparently just by making stuff up. They don't say anywhere in the paper how they decide on membership. It's completely bonkers.

I just don't understand how anyone could look at this data and decide, "I have discovered something worth reporting". Let alone when that person is the famous Brent Tully (I met him a couple of times, he seems nice). As with the M31 plane, there's no way I'd let this one past through peer review. Mad as clams, the lot of 'em.