Well, lo and behold, the issue was not solved with the new front drive unit... Got on the highway after leaving the service center and... damn.
To be honest, I never really believed the whole "bad bearing" story for my situation. I still believe it is some kind of electrical noise when the vehicle is at steady-state conditions between 50 and 70 mph, with the power bar relatively low. (e.g., ~0% grade). I just figured replacing the drive unit (i.e. motor, inverter) had a chance at eliminating whatever issue was present, bearing, cable connection, or otherwise.
I think this is one of those deals where the service center connected my research into the issue with the Tesla service article and figured a drive unit replacement was the best shot. The original drive unit might have had no physical issues after all...
I recorded another iPhone video today, this time shared via streamable. (I think YouTube filters out some of the sound content I'm trying to highlight.) You might need to turn up the volume and try headphones or earbuds:
2023 Tesla Model Y LR - staticky noise, 60-70 mph The staticky noise is present from 0 to 0:20 and 0:34 to 0:50. It is not present from 0:20-0:34 when I am accelerating slightly.
Funny thing is, I realized that 66 mph is kind of the magic speed where the noise is the worst. This is the exact speed where the technician said he heard the noise when we went for the test drive with me yesterday...
Reading through this entire thread a couple days ago and listening to some of the audio/video recordings others shared, I get the feeling that there could be several different types of noise issues on this thread. I think some of these could be actual bearing issues; maybe others are not.
My best guesses (most to least likely) at this time are:
1. Electrical noise related to how the front drive unit is controlled at steady-state conditions between 50 and 70 mph. I need to do some more research into how the front motor is controlled in this condition... maybe I can find a diagnostic tool/app that shows how the motor is commanded.
2. The replacement drive unit is bad like the original one. This is possible.
3. Something with one of the auxiliaries in front of the firewall. e.g., coolant pump, valve, etc.
4. Some kind of weird wind noise due to a pinhole air leak or something like that. Seems unlikely.
At this time, I plan to let the SC know that the issue was not solved and do a bit more research into the issue before heading back for service.