It is not a contraindication for massage at all. It is a contraindication for being in a supine, and even a prone, position. If the massage therapist is trained properly, they will know how to do a sidelying position massage that will be safe. Again, it is not the massage that is contraindicated, but the position that most people have on the massage table. Sidelying resolves the issues with supine hypotensive syndrome so there should be no problem for you to receive a massage, just lie on your side, or even better, just on your left side.