This only shows (it seems) that relativitic physics (meaning physics where some form of relativity holds, not necessarily einstenian special relativity) can be

This only shows (it seems) that relativitic physics (meaning physics where some form of relativity holds, not necessarily einstenian special relativity) can be accomodated for the possibility of speeds faster than c, not that this possibility actually holds. So the question still stands; only the argument that lightspeed is a limit because it is incompatible with relativistic physics should be abandoned (stated like this, it seems a fairly weak argument anyway).