I light of the PT, this sounds kinda weird. Qui-Gon was his main master, and in any case Obi-Wan was trained by several Jedi not just one as this statement suggests.
A suggestion has been made to change this to: "there you will learn from Yoda, a Jedi master who instructed me". I must say that I agree. It sounds like a simple way to solve a plot error with ease.