No. Anduin mentioned saurfang didn't kill him when he had a chance before. Therefore Boiking might have mind controlled saurfang back then but if saurfang is already mind controlled why bother having a conversation with the mind slave. And if anduin mind controlled saurfang during the cinematic why wouldn't saurfang of killed him during whatever previous chance he had.
Saurfang hasn't atemped killed anidun twice now so unless anidun mind controlled him twice saurfang just doesn't want to kill him