Academia is full of mechanisms to negatively judge your research work. In fact judgement is pretty much the only constant in the field: every single piece of work you do will be under constant scrutiny, will be torn apart both before and after publication, and your entire (research) value will be harshly judged by outsiders on a more or less constant basis.

The one positive of this environment that when you see someone who has succeeded in publishing a substantial amount, it's safe to presume that their work is not entirely without merit. That's not a 100% guarantee, but it's a good heuristic. A post like this implies that the author's personal judgement is more insightful than a process that I know to be enormously thorough and harsh, and yet it provides only vague assertions and no details on methodology. At the same time it's hard to ignore that the post is written by someone who is (understandably) a bit bitter and probably isn't being entirely objective in their evaluation.

In general it's not my impression that this sort of post produces reliable feedback that outsiders should rely on, and (unless it's very carefully anonymized, which it isn't) it also leaves bitterness in its wake.