The authority of the sages to interpret the commandments of the Torah

Hello Rabbi Michi….
Do the sages have the power to fundamentally reinterpret the commandments of the Torah? Specifically – the Torah mentions the prohibition "You shall not eat of blood" according to the interpretation of the Ramban and the Maimonides in the Mora, this is a prohibition on the existence of an ancient idolatrous cult related to inviting demons to eat together from a feast around a pit full of blood… In contrast, the sages demanded/interpreted the scripture regarding the prohibition of eating an animal as long as the blood that the animal was hanging on to has not come out of it, as well as a prohibition for a court that has been ordered to be killed to eat on the same day, and a prohibition from the rabbis to eat before prayer… What I was essentially asking was whether these prohibitions existed during the period of the giving of the Torah and the Bible, or whether the commandment against idolatrous cult, which was certainly very relevant to that period, was the halakha that stems from the verse, while the interpretations of the sages mentioned are new and later? And so while there are commandments in the Torah…
I hope I made myself clear……thank you.