“Rav Dessler emphasized in detail exactly the opposite of Slifkin. Rav Dessler emphasized Halacha does’nt change because Halacha was not based on the science, Halacha was based on Mesorah and in Rav Dessler’s view chazal were merely suggesting reason’s based upon the modern day science.”
You are completely missing the point. R’ Dessler acknowledges that the science can be wrong although the halacha cannot because the halacha is not determined by the science. R’ Slifkin also says that the halacha is correct, but he explains this using the reasoning of the Dor Revii. R’ Dessler and the Dor Revii both are acknowledging that the science can be wrong, but they give different reasons as to why the halacha doesn’t change. R’ Slifkin, for his own personal views has to choose one of these reasons. So he chooses the reason of the Dor Revii, probably because that reason resonates with him more. So I don’t see what the problem is.