Doesn't say anything about carriers, but it also doesn't say that the don't exist. The closest thing to support the "no carriers in Star Trek" argument is the part that states "stay away from Buck Rogers concepts." That's about it. It's pretty much a blanket statement and maybe this is why all the ships use the same idea for a basic hull outline? Still, I don't consider a carrier to be a "Buck Rogers concept". So, keep them coming and the fighters too.