They didn't factor for overall height. Taller but with shorter legs is a favorable build for many sports notably tennis whose players are frequently considered attractive. Judging by popular consensus not any objective evidence my thought is this effect would be swamped by overall height. Women often state a preference for tall.

Must be why the ladies were all over Fred Astaire.

I read this too! It could possibly be a subconscious preference, but I don't doubt that there's such a thing as a "Leg Woman"... Whilst simultaneously doubting the existence of a "Moob Woman"

Like the article said, the slightly longer legs were indicative of stronger genetics and immune systems, and the women were instinctively choosing men of that category, as they do with choosing men with odors that convey similar information about their immune systems and fitness.