David Lease is no more a skating insider than I am. And the fact that he said this proves it because that is not how it happened at all.
I am sure the Liu family has been getting pressure from all sides to get Alyssa a coach with a bigger name. I think a coaching change was inevitable. The fact that Brian Boitano seems to be the only skater we can remember who only ever had one coach and that was in the 80s shows how rare it is for a skater to come up to through the Senior ranks with the same coach that they started with.
That said, it does seem strange to do it now with all the travel restrictions making it impossible to work with the Canadian coaches and with the season so completely up-in-the-air. Given that Liu was already working with Lori Nichol and Scali, all they are doing is switching out Lipetsky for Barkell. So why not wait until Liu can travel to Canada to do that?
I'm going to assume it was for some reason that only Alyssa's team knows. Hopefully, for the sake of my own nosiness, it becomes clear at some point, but we may never know.