I’m not sure why you linked that video. The haircut thing wasn’t strictly compulsory, but North Korean state television did, in fact, broadcast a show called Let’s trim our hair in accordance with the socialist lifestyle, along with another show that used hidden cameras to find and shame people whose haircuts didn’t meet their standards.
That’s a different story from 2014, not about the 2005 broadcast.
You might as well ask why journalists don’t put targets on the backs of their anonymous sources by publicly identifying them. ALL reputable outlets sometimes use anonymous sources to protect the lives of people living in precarious situations. North Korea is not exactly known for treating citizens who talk negatively about how the government operates there well.