I know that it might seem difficult to get high speeds at first, and I agree with the previous comments that these sentences have been practised many times...
However, there are probably a lot of people who would like to see a video of someone tapping the sentence at 50+ wpm.
I'd be happy to provide a video of my tapping 'skills'. I probably couldn't produce another 32 second effort, but I can do it under 35 seconds quite comfortably.
However, I don't know if I have the equipment necessary to do so.
If you are interested Jean, let me know and I can see if I have the right equipment to do so.