Actually the Rambam himself makes clear that Chazal knew far more science then the scientists of their time in fact he categorizes people in three “groups’ and calls those that believe that Chazal were limited to that which was known in their time “fools” since even a cursory reading of Chazal show this to be simply false/
For further info see The Rambams Shemonah Prakim where he writes this in detail.
Interestingly Rabbi Jonathan Rietti has a fascinating tape on the Rambams diet where he brings numerous examples of medical statements made by the Rambam which were completley based on Torah Knowledge and were only discovered hundreds of years later.