At the Pilgrim’s Office, they issue two documents that shouldn’t be confused: the Compostela (the traditional/historical and free document) and the "Distance Certificate" (introduced in 2014, for which you need to pay 3 euros).
The Camino you took isn’t specified on the Compostela. If you’ve walked more than 100 kilometers, they’ll give it to you without any issues, because most likely, during the last 100 kilometers, you would’ve joined one of the routes officially recognized by the Cathedral of Santiago—like the Geira in your case.
On the other hand, the "Distance Certificate" (which is what you need to fill out the form for) is digitized, and they won’t list "Camino Torres," because according to their rules, it "certifies the number of kilometers traveled along one of the routes officially recognized by the S.A.M.I. Cathedral of Santiago." However, if you insist in person, they might write down that you started in Salamanca and calculate the distance accordingly, as if you’d taken the Vía de la Plata (as happened to
@Denmanmurphy) . I’m not sure if now, with everything being digitized, they’d be able to leave the route name blank and have someone from the Pilgrim’s Office kindly write “Camino Torres” by hand.
On the forum, you can find tons of threads about the “Distance Certificate” issue and how they calculate the kilometers, especially for routes not officially recognized by the Cathedral of Santiago (like Torres, Madrid, Lana, Levante, or the Interior/Nascente Portuguese route, among others).
Unfortunately, for the same reason, there aren’t any official statistics for the Camino Torres either.
Personally, since it has nothing to do with history, I’ve never understood the appeal of the “Distance Certificate,” although we Spaniards do love to “certify” everything.