The question is framed to imply that they would not invest in Didi were Uber to not also be vying for power -- aka this is a swipe at Uber rather than a strateg

The question is framed to imply that they would not invest in Didi were Uber to not also be vying for power -- aka this is a swipe at Uber rather than a strategic investment in China. The actions may be identical but the intent is different.