This is a fine argument articulated quite poorly. A) cancer cells constitute a separate species, or at least evolutionary "actor". B) the tech naivity is not

This is a fine argument articulated quite poorly. A) cancer cells constitute a separate species, or at least evolutionary "actor". B) the tech naivity is not that things can't be deeply understood, but that it's a moving target, and less than complete erradication of the parasite just increases evolutionary pressure leading to decreased understanding of the foe.