Don't take this the wrong way, but how do you know this? It seems like just an assumption, and it is a fair one, but we shouldn't forget what it is in the first place (if it is actually just an assumption)
No offense taken. It's a fair question. The answer is basically that I read a LOT & I pay attention & I'm familiar w/ how the entertainment industry works and so the combination of quotes, descriptions, & stories, when put together, spell it out. I guess you could still call that an "assumption" but short of Disney essentially throwing Lucas under a bus after selling them Star Wars, they're never gonna outright say that he's no longer a part of the decisionmaking in any way. You leave the possibility hanging there, it works both ways: Fans who still like the guy are calmed by the hope he can keep things on track. Fans who dislike the guy can use him as a scapegpat for bad decisionmakong, as they've made habitual over the last 15 years. Either way - they've got some cover, and they don't look as if they're burning bridges or being cold about the transaction.
But the Arndt articles all mention Lucas handing stuff over... and stepping away. The Kennedy articles mention the same thing. The Iger/sale articles mention the same stuff. the Kennedy articles mention that he gave her the keys to everything. The Iger articles have her going and hiring her because he knows they want new movies. And of course, he doesn't initiate the sale in the 1st place if he still wants any creative control. All of his participation in these movies have consisted of him moving away from the property. Even the videos they put up w/ him & Kennedy about the sale basically reinforce that Kennedy CAN check w/ him, if she wants. But he doesn't expect her to. Nor should he. Because he hired her specifically to take the whole thing over.
Basically, you don't go around putting the guy who sold you the company of his own volition, & the guy who put you in charge of that company, on blast like that. You don't just say "Yeah, he's out." You make all the right noises about respect & legacy & vision.
And then you hire everyone else and move away from him while he cashes out his stock & gets his philanthropy on.