It also states that the whole thing will have been finished by 2007, although of course in reality it took a lot longer than that.
Did it? Pretty sure the Revenge of the Sith came out in 2005. George has made it very clear Disney’s movies have nothing to do with his vision, so they arguably shouldn’t even be part of this particular discussion.
Even without external considerations, I think by ROTS George was well and truly exhausted and never would have made another, regardless. Doing two more trilogies probably sounded really nice to him in the 70s/80s, not so much after getting much older and having dedicated another decade to Star Wars already.