I think that might be why it got shunted into the 8-12 pdf, because it is printed on the reverse of the last page of that section.
They probably weren't aiming that advert at the Junior Summer Uni market, I'd say, just mucking it up because of the 'cult of the pdf' on council websites. Someone not paying close attention. Chlamydia screening campaigns are usually aimed at the older teens and young adults.