> There is no normal height.

There more certainly is a statistically average height.

> Out of 4,063 pilots, not a single airman fit within the average range on all 10 dimensions.

This article is comparing 10 dimensions of variability and we're talking about just one here, the one you yourself mentioned, height.

Statistically or mathematically average height does not equal normal height, it has no relevance in this discussion. If you read the article, the average does not fit most people even if you take a single dimension, height.

Within one standard deviation of the mean does, by definition, fit most people for a normally distributed factor like height. (64% > 50%, thus most). "Within 1 standard deviation of the mean" is a decent (if possibly overly strict) definition for "normal" in this context.

Read the article in the link and then explain your comment.