I can attest to this fix. I bought a set of replacement VW door locks with 9 pins that fit perfectly but did not lock/unlock with switch or remote. I swapped the mechanical new parts onto the electronic from the original and WOW - I have locking doors for the first time since I've owned the car. I did have to switch out the spring loaded slide mechanism that mechanically locks/unlocks because the cheap VW part had a plastic part where the original was metal (see photo) -- used the metal piece from the old and it works great
