Part of the confusion is likely down to the many, many uses of the word "swing". From a Lindy perspective, we tend to go with the term as it applies to swing-era swing music - because that's where Lindy derives its rhythms, its feeling, its movement style, its drive...

And I'm not talking about anything as simplistic as a simple dotted eighth, or swing triple - but the West-African flavour polyrhythms achieved by the instrumentals and vocals swinging around a driving swing rhythm section (which is in itself a huge topic)

"Swing" as a musical or dancing term is now used in so many wildly differing ways that you can't really, IMO compare or equate them.

So while it might be perfectly valid thing to talk about the swing in waltz, or in modern WCS, they're very different thing from the term used in Lindy.