Well.. good question! I am of the opinion that PM docs aren't necessarily the "authority" to spines. They are great at trouble shooting, but I have to disagree that by pressing on your disc area that it wouldn't cause you pain.
I can tell you with my torn disc that I had, when put under any pressure (ie - pressing or otherwise) it hurt. Now maybe the disc itself wasn't hurting, but what was being done to the disc (pressure), certainly caused pain. I hope that makes sense.
Also, my new PM doc says I am healed from my surgery. I disagree. Yes, my fusion may be healed, but I continue to feel better and am able to do more and more and my pain level continues to improve and I'm 15+ months post surgery now. So I think their answers are sometimes more clinical and not necessarily a true full scope answer.
My two cents worth. All the best to you.