It's training vs practice. They practice for a show.Performance that they still need to be trained for, dispite it's for display purpose only
Military "training" is a different matter.
The university military days all get actual PLA soldiers to go do 3-5 days of "training" for the students. Basically marching, standing straight and in order then finish off with gun safety and 5 shoots. It's suppose to put discipline into the kids and prepare them for militia like for people's war back in 50s. Now it's just a couple of drills and no one really take it seriously.