In the decade I have been reading pg, my opinion of him is that he is like Nietzsche, or Ayn Rand or Karl Marx or Hayek or (the HN frequent front-pagers) Scott Alexander or Maciej: catnip for "free thinkers", a ready-made meal for people who crave thinking different; but ultimately fairly empty compared to the hype. Making grandiose theories, out of the flimsiest of observations, that fail at the slightest contact with reality, and only good at motivated reasoning.
Modern-day sophistry.
That sounds like a typical philosopher for better or worse more than than sophistry per se. They have been plagued by a preoccupation with 'purity of thought' and separation from the 'practical' world since Ancient Greek times, almost certainly related to them being sponsored by essentially aristocrats.