This is the same guy who fired 2 GMs on the Sixers in 2 years. Talk is cheap. It's a business, and if you don't produce good results(which they haven't recently) changes are likely to be made.
He fired two Sixers GMs because they were both idiots who made stupid moves and ran the team into the ground. What I read was "I don't fire GMs just because the team isn't winning", not "I don't ever fire GMs". Trade two future starters for a guy who will never play a minute for your team, you might lose your job. I don't understand what the connection is between the situation in Philadelphia and these statements.