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.
He was literally measured as 6’ 9"and 3 quarters by the nets in 2019.
Either he has some condition to grow still or NBA heights went back to being “billed height” WWE style.