Why does he need to make a historical justification for it then? It would be disingenuous if, as the blog author suggests, Andreessen knows better.
the only pseudoscience you mentioned is the idea that mental "afflictions" are entirely biological
Since mental illness or other trauma is entirely contained to the brain, you can in fact say that the problem is entirely biological. We are starting to see the tech industry make real inroads to biology. Neuralink, gene therapies, AI designed drugs, etc. All of these innovations will decrease the need for therapy, which at best you can say helps people learn to live with conditions, but never permanently fixes the problem.
Doesn't really matter when most of the results are unreproducible.