Given that there are many academic philosophers out there, if we assume that non-academic philosophers are disinterested truth-seekers who are not motivated by political and status concerns, then we should expect to see frequent collaborations between non-academics and academics, or at the very least we should expect non-academic philosophers to frequently cite the academics.
A very analogous argument to yours would allow us to conclude that non-academic philosophy is not about truth-seeking.
It goes the other way too; Taleb and Yudkowsky are not completely ignored by academia. Nonetheless, the insularity of academic intellectuals and the disdain for academia of non-academic intellectuals are real phenomena. There is a symmetry to the situation, but Dan wants to draw an asymmetric conclusion.
Let’s try inverting your central deduction:
A very analogous argument to yours would allow us to conclude that non-academic philosophy is not about truth-seeking.
But we do see non-academics citing academics. Non-academic amateurs will refer to the likes of Quine, Russell, or Searle.
It goes the other way too; Taleb and Yudkowsky are not completely ignored by academia. Nonetheless, the insularity of academic intellectuals and the disdain for academia of non-academic intellectuals are real phenomena. There is a symmetry to the situation, but Dan wants to draw an asymmetric conclusion.