R’ Slifkin doesn’t say that the halacha is wrong. He says that Chazal may have made scientific errors (which caused them to pasken the way they did) but whatever they paskened is halachically binding.
This compromise is absolute nonsense. Practically the only one we find questioning the accuracy of Chazal’s science was the Pachad Yitzchak, and he therefore wanted to pasken differently.
If the science was wrong, then the psak should change.
As I’ve posted before, I strongly believe that Chazal’s stated facts were correct, even when not in consonance with current scientific belief.
Slifkin brings a few “sources” for his contention that the halacha would remain the same, even were Chazal’s facts ch’v wrong, based on the notion that the importance of the authority of Chaza’l would supercede even an issur d’oraiso. This is impossible, and he misreads his “sources”.