The prediction is probably right, and it does not bear on the claim. Judging a proposition by its reproductive fitness is a category error: on that test, celibate monastic traditions and the Shakers are philosophically invalid. Truth is not subject to natural selection. The asymmetry of suffering is either a sound structure or it is not, settled by the validity of its premises and the coherence of its inferences, not by the reproductive habits of those who accept it. Treating memetic success as legitimacy would validate every popular delusion in history and invalidate every unpopular truth; the Copernican revolution was self-defeating for the better part of two centuries. The view also does not require universal adoption: it requires that whoever exists develop the capacity to address sentient suffering structurally.