Can my Tummy Tuck Have Come Undone 2 Yrs Post Surgery?

It is possible, that the hard massage might have torn the permanent sutures of your tighten muscles, and pushed the muscles apart. But, your tissue should have been well healed after the surgery. However, no massage will give you loose skin or excess fat.  If the swelling persists, I suggest you see your plastic surgeon, and even consider getting an ultrasound of your abdomen.

The only thing that would undo an abdominoplasty would be a subsequent pregnancy. Any massage you receive will not undo the operation.

Photos would help, if any are available. It is hard to imagine any sort of massage that could disrupt the abdominal wall this far after surgery. By six weeks the repair is quite solid, so even removal of the sutures should have no effect. An evaluation by your plastic surgeon will be your best option to figure out what is going on All the best.