Ideas on this noise?

Wondered if any of you could shed any light on the noise at the end of the video. Happening on my wife’s ‘15 Golf with the auto trans. Dealer once tried to tell me it was a secondary vacuum pump or some nonsense but I think it’s trans or torque converter related.

Happens most when the car is cold. A good example is if I need to move it in the driveway to get another car out. I’ll pull forward and come to a stop and change to reverse, I’ll hear the noise as I do it. I’ll back up into the other side of the driveway and put it into park. I’ll hear the noise as I do it.

Let me know what you think.

https://youtu.be/ZtkBf5lDFEE

Edit: Here's an easier to hear video. https://youtu.be/MxEHD20Mdno

Bumpity

Bumping this with a new video.

Do you guys think this is the SAI? Seems awful loud to me and I think has gotten a bit more pronounced as well vs my first video. FWIW, and I know they're different animals, my GTI with DSG doesn't do anything like this at all.

Idk man, that sound super hard to diagnose.