I wonder if his teacher was one of those legendary disciples. As well, eating meat literally powers him up and has to meditate afterwards to complete his next stage.
People really want Mc to learn some cool cultivation techniques but with his intelligence i don't think he can follow an ordinary cultivation path. He has quite a unique body so i think he will got his own distinctive cultivation techniques.
Remember, when he says his master its to refer to his father. His view of the world is also skewed by his father being a sovereign (probably). The old man sweeping may have also been a sovereign and is giving Noh a nostalgia of sorts.
Reading some of the comments here and... holy shit, did he just get inner Qi without cultivating? Holy shit, talk about peak body condition, bro's body is so strong that it started absorbing Qi by itself lmao