I don't think that's true. I think the point he's making is that there are things that many chidlren don't know. For exaple, that from a ranking perspective for core subjects, certain universities definitely are well acknowledged as being better.
Ditto the business studies point - I'm not anti business studies by any means. But it is a FACT that an A level in maths will give you a better chance of getting into university, particularly a good university, even if planning to study business, than a business studies A level. And children should know this when making decisions.
I have worked in media for nearly 30 years. Nonetheless, I think a generalist subject at A-Levels is more useful than Media Studies. You can do Media studies any time, but it's not as easy to access the basics in other subjects. Similarly, DD is both academic and very focused on dance. I have no problem if she chooses to pursue a creative/dance/arts career. However, she can do the work to move into that later - at GCSE level, and probably A Level - if she takes more "traditional" subjects, she has more options. A dance college is not goign to reject her because she doesn't have a Dance A-Level. But that engineering degree will reject her if she doesn't have the right A Levels.