Maybe he changed but money was certainly a possible motive, never trumpers know where the money is and they know they are toast is they don't support him. I will never trust any never trumpers
The clip looks like they are rallying to protect Obama and throwing Biden under the bus, trying to contain the damage coming.
The only rational explanation is that they are actually doing their job, the public fighting was to give them to move without being hounded by the press. It would be insane for Trump to keep them on otherwise.