You might be over thinking this. The FCOM is notoriously sketchy with its information, giving you only what Airbus think you need to know. If the FCOM stated that the bird DID NOT have a static feed while the FCTM said it did then I would obviously go with the FCOM. However in this case I believe that the FCTM is adding information to that given in the FCOM rather than directly contradicting it.