Balderdash. Vader, being the villain, would feel compelled to capture Bond and stage an overly elaborate execution where he prattles endlessly about his plans only to leave before Bond was actually dead while just assuming the execution was a success, allowing Bond to escape and foil Vader's plans at the last possible moment, saving the day (cut to scene with Bond and Leia enjoying each other's company in a lifepod while British ships race to "rescue" them).