I too think the asking was more of a formality as I don’t see how there would be any legality binding it to George’s say so since he pretty much signed over everything.
A formality, yes, but I think it’s one they intend to carry forward for the foreseeable future. Lucasfilm doesn’t want to alienate their namesake, and Disney wants to stay on good enough terms with George that he’s willing to, say, come out and give his blessing at the opening of their new theme park land.