This is a tricky one. In your 2011 Multivan the mirrors on each side are folded and unfolded by a LIN-bus command via the electric window motors, so there is no direct electrical connection to the mirror motors going to the inside of the car. The command travels via the CAN bus into the door.
The neatest option I can think of the top off my head, is to take off just the drivers side door panel, and then capture the existing OEM switch input cable that sets the mirrors to fold, as well as the door lock/unlock signal. But you'd have to somehow set the Chinese module to "hold" the switch input the whole time you wanted the mirrors folded/unfolded - because that's how the OEM original solution works.
If you want to do it without complex electrical trickery, then you'd have to take off both door cards, cut the mirror motor wires before they enter the window motor, and then just interface the Chinese module to those wires (completely disabling the current OEM system with it's LIN bus and CAN bus stuff) ... but this involves pushing the wires through the door-to-car loom tube which is a major pain.
Ultimately I think your whole issue of just wanting the auto-fold-on-lock is a different animal to the one in this thread, and the Chinese module is not likely the solution:
The neatest solution would be a simple chip plugged onto the CAN bus wires (high and low), which listens for the "door lock" CAN command, and sends the "mirror fold" CAN/LIN command, and vice versa. Is there such a solution?
It's stupid that VW don't just have this as an option in the menu... it would be three simple lines of code in the BCM CPU

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