The rear spoiler on my 4S sedan is sitting in a non-flush spot, so the frontmost points on the outer edges stick up a bit. This seems like a non-aero-friendly spot. I just got the car back from having the heater replaced and they didn't mention it (I forgot in the rush to pick up).
I had the update on Aug 6 and the option appeared for me this week online in MyPorsche. I paid for it yesterday afternoon and it's active this morning.
Long time reader, first time poster.
I've got this noise in my MY21 4S, evident with the windows down. I don't think it's the brakes, but rather the regen system. Other posters pointed out that the noise isn't present during coast (SC: Normal, Range), which is consistent with my experience...