Everyone has an opinion. Here's mine (and note that I am *not* a medical professional (just like your doc is not a lifting professional - he's just repeating what he learned. I wonder if he ever questioned it....)
OK, the mesh repair is a mechanical repair that covers a defect in the abdominal wall to prevent your intestines from pushing through said defect. You get opened up, and mesh gets put in place, and then sutured into place, usually with a post-op suture material that will eventually dissolve / be absorbed. It hus provides a mechanical barrier to prevent protrusion of the intestine through the defect, and it serves that function immediately. Hence why it's ok to sneeze and cough post-op. The question is not "Can it be loaded," the correct question is "How much load can it withstand, and how quickly can that load be ramped up?" So, while legally recommending that you follow your doctor's advice, I will relate that several lifters that I personally know or coach, including myself (triple repair), have been successful in getting back under the bar as soon as pain subsided enough to squat - for me, this was 7 days. Note that during surgery you will be injected with a long-acting anesthetic, and you'll feel pretty good for a short while (1.5 days for me) after you wake up, and during THIS post-op period you need to be very careful. After that anesthetic wears off, THEN it'll hurt and when that pain subsided, I got back under the bar. Just the bar, for several sets of 5. I added weight as pain allowed - if the pain subsided during the sets, I kept working. It's uncomfortable while the mesh is integrating, and I felt several instances of stretching sensations and some pulling, but that's part of the process - getting the mesh to integrate while the body is moving through a normal ROM. I was back at 185# when I went back in for my surgical follow-up, upon hearing my surgeon had kittens. But stress-recovery-adaptation applies to injuries too.
It'll be an accelerated LP, but follow your doctor's advice.
No, it's not a muscle belly tear. 5's are appropriate, in incremental increases. But follow your doctor's advice - because I don't wish to be sued.