Seeing as this thread will no doubt be locked now as the arguements are carrying on, I thought I would point something out.
Not one bit of what you just posted states that stretched tyres are illegal, it does however say what the manufacturer should stick to. It also points out that your tyres should not come out further than the wheel arch, which agrees with one of the original posts about stretched tyres happening in Germany.
Tyre manufacturers do not make laws, everything they say is a recommendation.