It's fairly obvious (or should be) that those three talented ladies will not be dancing at the same level as in 1969. It is exciting that they're making an effort to recreate that energetic dance, to the best of their abilities. Their efforts should be praised. It's also for a worthy cause.
"Noel [Coward] and I were in Paris once. Adjoining rooms, of course. One night, I felt mischievous, so I knocked on Noel's door, and he asked, 'Who is it?' I lowered my voice and said 'Hotel detective. Have you got a gentleman in your room?' He answered, 'Just a minute, I'll ask him.'" (Beatrice Lillie)