Incidentally, perhaps the chemistry are being taught the maths that is applicable to them. Proving lengths of sides and such things as in the Chinese example is, in my opinion, pointless except as an exercise. I'm about to start a PhD in theoretical physics, and I can say that I've never had to do any such proof like that. Using the same maths, sure, but not that sort of question.
After all, maths is just a language. What part of the language you learn is dependant entirely on your requirements.
Also, as with all universities, the difficulty of the exams and exercises depends a lot on the university itself. I'm sure some of the Oxbridge chemistry maths is harder than that quoted.
The article is little more than 'common maths knowledge' rubbish, for those that haven't studied it beyond GCSE or equivalent.