Gavra, you are defining ???? ??? ???? as spontaneous generation, but that’s likely an incorrect definition. Had we defined it that way and decided to accept the disproof, we would have assered killing kinim. See P”Y.
Also, the treifos issue is not similar. Nobody is claiming that Chazal were wrong, but that the classification of treifos, and therefore the halachah, is determined by what the metzius was at the time of Chazal, and doesn’t change when the metzius changes. IOW, the definition of a treifa is a condition which in Chazal’s times would not allow an animal to live for 12 months.