I will translate the Ohr Hachaim above as it is necessary for our discussion:
We are permitted to explain the meaning of the words and reasons of the Torah after scrutiny according to our understanding even though the previous rishonim explained it in another way as there is 70 ways to understand the Torah. We are not allowed to explain it when that causes the halacha to change. The Amoraim did not argue on the Tenaim on halacha. However, the pesukim they did explain differently than the Tenaim, so similarly we can do the same.