> The term "overweight" does not differentiate between muscle and fat, plain and simple. You're wrong.

You're wrong. The typical diagnostic method for overweight and obesity (BMI) does not differentiate between muscle and fat, because mechanisms that do are too expensive/complex for the use, but the term, in fact, does.

At their most basic, the words “overweight” and “obesity” are ways to describe having too much body fat. [0]

Overweight and obesity are defined as abnormal or excessive fat accumulation that may impair health. [1]

[0] http://www.hsph.harvard.edu/obesity-prevention-source/obesit...

[1] http://www.who.int/mediacentre/factsheets/fs311/en/

Both your quotes are followed by BMI index, which technically doesn't take into account fat/muscle ration by definition.

But I do concede, overweight in that context does refer to excess fat.