I haven't seen the footage and I don't know what the sound quality is. But I do know a lot of CCTV doesn't have audio or at least good quality audio (yes, even LiveBarn), so it's entirely possible Dave edited it in. It's also possible they're practicing the timing with old music.
Repeating lifts and twizzles isn't a bad idea if it gets the element called. Now, it may be a bad idea in this case since calling standards have changed, but it's not wrong to keep what works if it’s still within the margins of current calling standards. AFAIK these twizzles would work for at least one program, but may not be stylistically up to date for GOE purposes.