The article says that Disney wants to move the current sequels to a brand new timeline which implies that this new timeline is an official timeline in the sense that it's blessed by Disney, but it's not the timeline that most people would consider to be the official timeline, aka the timeline where the original and sequel trilogies happened. It's basically Disney going "Well, we can't ditch this, but it kinda sorta happened, but not in the timeline you think it did. Surprise!".

Meanwhile, anybody with 2 brain cells to rub together is going to look back at how Disney marketed this originally and think "Whatever you say, my guy".