Where are you getting those stats? The Adam only being 5'2 leads me to believe they are coming from the 200x version of Masters of the Universe. He-Man was indeed taller than most of his compatriots in that show.
In the classic MotU, which the statue in question is based off of, He-Man was never, ever shown to be 6'11 unless everyone, or around 95% of the Masters, Eternians, Etherians, Skeletor's goons, Hordaks Horde and the Snakemen are all 6'11 too.
They are all the same height, with the women being around 1-2 inches shorter with 3 inch heels on. I'm guess, based off of average male and female heights when the show was created that the women are 5'8 to 5'9 and the men are 6'2 to 6'3.