Hmm, some of that is just bad teaching though - I taught part of it last year, with younger pupils than that and that's not how I would describe it to them at all.
Like I said before, I liked the maths bits, not that I understood a massive amount of the actual maths, lol.
The way I pitched it was, people with ASDs often have very strong interest in one thing, for Christopher that's maths, he likes the orderliness of it, which is why you get a big explanation of something to do with maths when he's stressed, he retreats into his nice ordered interest when things in the real world are upsetting him - much the same way other people do with books or computer games, but because he doesn't make the same sense of the world, it's much more often.
But saying that AS automatically equals an interest in maths is just lazy teaching in my opinion, they've nit done enough research, though my DS has AS so I'd think that of a lot of teachers, lol