It has been known for a long time KD was listed at 6’9 which may have been his height entering the league, but after a few years he grew (very evidently) and was closer to 7ft. After 10+ years the NBA listed him at 6’10 and this year, finally he is listed at 6’11 officially.
“For me, when I’m talking to women I’m 7 feet. In basketball circles I’m 6’9." -Kevin Durant (wsj.com)
https://www.reddit.com/r/nba/comments/4hrkou/for_me_when_im_talking_to_women_im_7_feet_in/