Basic steps performed very well, as on this video, are beautiful, and easy for the judges to 'read'. It can be difficult to perform them well. For example a feather finish into a 3-step is quite a tricky transition - if you want it to look really good.
I thought intro +64 bars was the regulation length of music for championship events like this. The phrasing is very easy to pick. I wonder whether this was a demonstration, as Hawking interprets the music perfectly, as if he'd prepared a routine for it.
I noticed that Gozzoli's partner does a couple of twitchy head movements as they move across the floor - as if she mis-read his lead. Interesting.
you can of course learn something from videos like this, but i don't think it's an efficient way to learn.