Okay, not quite that limiting. With the wife's aid, we conducted a couple of experiments. The scenario I paint: Screaming (grand)children in the back seat. Cranky grandma, equally put out grandpa. Grandma says, "Stop the car. I have treats in the trunk." I stop the car and she gets out while I put it in park and engage the parking brake. She's obviously having difficulties opening the trunk and comes around to her open passenger door. "It won't open." I say yes it will, just lift up on the little rubber area to the right of the rear camera. "I know THAT!" she says, now exasperated with me. Do I have to do everything myself? I ask. On a whim, I try unlocking all the doors. Voila! the trunk now opens to her touch.
We tried it again, after I stopped and restarted the engine, put it in "D" (all door locks snapped shut), then back into "P". I left the key in the car and went to the back and lifted. The trunk would not open. But when my wife hit the open button, all the door locks clicked open and, it worked on the trunk. No subsequent hitting of the lock button would make the trunk unopenable. So, the unlock button works as a trunk release, in the sense that you can actually open the trunk now, whereas before it was locked.