Yep looks like revision M is the latest / solution
Sorry no idea bud....I think early 2019?
You can see the part number from above with an inspection mirror and a torch (flashlight!?), the number is on the front of the housing pointing directly forwards, mine was replaced around the same time as yours and is the M revision.
?????
When VW started to develop the MQB platform they created several teams dedicated to reducing non-functional weight wherever possible. It really was an impressive effort. This is a big part of the reason that the Mk8 Golf was dimensionally larger and had much greater torsional rigidity than the Mk6, yet weighed even less than the earlier iteration. They went as far as drilling holes in the inner seat frames to keep the weight down. The use of plastic, instead of metal, wherever practical, was all part of this war against unnecessary vehicle mass.
It weighs less than its predecessor which had a bigger issue with thermostat/water pump failures.
The added torsional rigidity while decreasing weight was indirectly from using plastic parts: seeking weight savings throughout the car--including the replacement of metal with lighter plastics--allowed VW to increase the thickness of the body/frame metal, when needed, to achieve greater torsional rigidity without any net weight penalty. The Mk7 is much stiffer than the Mk6, greatly due to this effort. And though some of this weight savings also translated into cash savings to VW, again, some of those saved Deutschmarks went back into the materials for sections of the car which were beefed up over the Mk6. I'm driving a 2015 R, daily over cobblestone roads, and am still waiting for my first squeak/rattle that wasn't attributed to the Styrofoam rubbing beneath the trunk cover.