Basically, it would be fallacious to presuppose that instinctive pleasure toward supposing a pleasurable after life rather then the contrary would not evolve from a cro magnon man even from a lower derivation , , because in Neanderthal man the conscious choice of attack/retreat was already evident, the instinctual pleasure of survival implies the transcendent reduction , as a solution to the paradox.
Therefore to connect pleasure with existence is primordial and instinctual.
With subordinate mammals the consciousness manifested in early man is not supported by activities and artifacts implying conscious capacity to make choices. But early man usually buried his kin, and implies a consciousness of the connection.
Such connection, does not negate the natural perhaps unconscious content of various differing evolutionary preceptions of the content.
Therefore the fallacy is an inductive presumptive hypothesis based on the reduction of phenomenological awareness limiting determinism to a purely conscious manifestation, and has to be modified, or at least augmented by the instinctual determination, that does invalidate the fallacy.
And I think , even then, Your thesis can stand, but not without the arguable idea, that lower forms with as yet undeveloped will, can not be presumptive of a total denial of predetermination . in other words , an almost total reliance on instinct may not cut an animal from a human and lead to a conclusion which define mostly pure determination from natural causes, because the intermediary of primitive man can attain consciousness of partial awareness.
Paleontology has evidence for this factual progression, and too label this purely fallacious because of a modern notion of an existential reduction, misses the point.
I feel You may not accept this in Toto- on anthropological basis, however so
much transcendentilism has been nullified on its face, that it reminds of the theory that is protested against too much.
To over emphasize so much signification on conscious meaning per se, indicates the fact that science is merely a component of analysis of all that already is in the analysand.