I'm not saying it's buying a certification. What I get out of it is that it's basically just an affiliation. You can say you are affiliated with ATT, but you aren't actually any part of ATT.
Is there anyone from ATT teaching at these schools? If there is then I could see how it would be a "certified" school as far as what I'm getting from you. Our school is affiliated with ATT, but we have an ATT brown belt straight from Liborio teaching at our school.