Nobody is debating Lucas' accomplishments here. His statements on the number of planned films in the saga has been fluid over the decades, and often depends on when he was asked about it. The vintage Starlog interviews simply reinforce this.
Now, post Disney deal there are new tales to tell. This isn't much of surprise to those of us who remember when nine films was the official number.
I doubt even George recalls all the different answers he's given since the '70's. I have trouble remembering stuff I did last week.
In spite of what Roy Thomas said in Starlog #120, George might even like a certain big green rabbit now. ;)