The kicks in the Golden Age

In her book Christine Denniston writes that most of the advanced moves we use today were actively used even during the Golden Ages.

"Modern Tango dancers are sometimes surprised to find that the social dancers in Buenos Aires in the Golden Age danced these same kicks and flicks on the social dance floor."

I am reading the words - on the social dance floor - again and again.
Who did start the talk about to exclude these moves from social dance floors?

 Christine Denniston: the meaning of TANGO, The Story of the Argentinian Dance
 (p. 152)