Yeah I don't particularly think the insta bio edit means the deal is in peril, but I also can't think of a good reason to delete it. What are they trying to keep it a surprise? Lol. And there's no visa, employment or other legal requirement - referencing a sports team is not some sort of legally binding statement. Hence, ¯\_(ツ)_/¯.
It's probably the team not wanting to "spoil" the news even though we all know it. He was doing instagram stories on the flight, then magically stopped when he arrived in NY.