The closest thing to rationality content I can pull from this is "just because a thing looks good, doesn't mean it is good".
Look closer. It's a comment about organizations which exist mostly for the benefits of their employees. One might call them parasites.
He lists a single "parasitic" non-profit, and then declares the entire field of non-profits to be corrupt thieves on the scale of the financial sector. This post is explicitly about his disgust with the "non-profit world", and he pretty clearly believes that this sort of this is common despite providing no strong evidence in support of that belief. That is his mistake, generalizing from a single example with no additional evidence provided or even discussed.
Another month, another rationality quotes thread. The rules are: