So the car is finally fixed after over a month of back and forth with the dealership and BMW Canada.
Exhaust rattle noise was due to a faulty muffler. This part was easy, the dealer ordered a new muffler and I just had to wait a few weeks for it to arrive from Germany.
Parts changed:
18-30-7-933-843 Rear Muffler with Exhaust FI
18-30-7-560-782 Clamping Bush
"Driver Assistance support reduced" error and audio malfunction took a while to figure out. Long story short, the "RAM" or Receiver Audio Module, aka the Amplifier, is the culprit. Initially the dealer/BMW Canada ordered the wrong part so I had to wait another week for the correct part to arrive.
Part changed:
65-12-9-859-200 Receiver Audio Module
(This is the number shown on my service record. I Googled this part number and I don't think this is the correct one for the G20s.)
Anyway, I haven't seen any error messages or audio malfunction since and I hope it keeps it that way.
Now, for the compensation...
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