Surely something else is going on that we don't know about. There is no way that Stevens goes from mostly a very good GM who has made many very good player acquisitions to this trade that makes absolutely no sense. Keeping Jaylen for the time being would have been way better than this, which looks like an effort to become a weaker team.
(The only explanation is the owners deciding to save money, which would be a very disconcerting red flag .............. though they were willing to pay Giannis' salary ?)