I was just passing along what we were advised, from the original owner (a veterinarian at the imaging center) that purchased DeRp as a kitten. His advice came along with a lot of other interesting information, like how Savannahs cannot be vaccinated for things that "normal" cats can. He seems to know a lot about Savannahs, so we've just taken his advice, as well as the miscellaneous informational tidbits from all the other vets, interns, and techs at the center. Everyone seemed to agree, so... we just go with that.
My advice is to find another vet because that dude doesn't have a clue. SVs can, and do, receive all the same vaccinations as other cats. We have a lot of accurate information here that you can read to educate yourself so that you're not victim to more misinformation about the animal you care for.