“lice come from eggs but they don’t *really* come from eggs”
I always understood this answer to mean that Chazal was wrong, and Al Pi Teva of their time they should have made the other Halachic choice, but none the less Halachicly they are right. This is because Hashem makes/changes the Teva in an unnoticable way (that we do not understand) so that the Teva will follow the P’sak of Chazal.
Correct me if I am wrong?