After reading through the Reddit thread, I would surmise that those comments you quote are themselves not well-sourced (there are no samples provided at all of low-quality Philosophy SE material and a fortiori no proof that the domain of possible samples is weighted towards low quality).
Also, in philosophy, and adjacent/vaguely-overlapping areas (e.g. foundations of mathematics), one person's nonsense is sometimes another person's self-evident insight. I was just reading a sort of rough draft of an essay about an exotic kind of alternative set theory, by an established writer, in which they went on about lassos and vanilla wands. On the surface, such talk is bizarre and "nonsensical," as would be comparable talk of mice and weasels, yet that talk too is well-grounded in the field.
So, you could take the given essay here as an example of philosophical nonsense or even mathematical nonsense that is nonetheless acceptable within philosophical and mathematical academia. And historically, the work of some or another philosopher has been regarded as nonsense by other philosophers. At one time, it was even fashionable to claim that all "metaphysical" propositions (whatever those were supposed to be as contrasted with "non-metaphysical" claims) were nonsense.
Beware those who like to appeal to "what's obvious" and "what's silly," etc.