The NBA measurements are almost laughable. I know Wilt had his height altered for years. Shaq was NEVER the weight they listed him at. Almost all guys are measured height with sneakers on.
Players have a say in how they're listed also. I remember watching an interview with Durant about why he wouldn't let OKC or Golden State bill him as a 7 footer. He is definitely 7 feet but he's listed at 6'11". Apparently he feels if he were listed as a 7 footer then people would expect a different game from him, a more interior PF style of play rather than as a perimeter scorer like he is.
Found this piece where he says he's 7 foot in sneakers, but it's not what I saw a little over a year ago. Anyways, KD is definitely taller than his listed height and the point is that players have a say in how they're billed.