Not super human. Just placebo. Unless it’s using a weird Bluetooth mode like HSP but that’s unlikely because it would be horribly compressed.

It’s hard to tell if it’s just HN imaginary “horrible sounding” or if the mic is on for some reason which makes it actually sound that bad.

I don't know anything about the car's sound system, but aptX is a pretty common Bluetooth audio codec for music and these days it can run up to 420kbit/s with the adaptive codec, or 576kbit/s with HD, 24 bit at 44.1-96kHZ, so it's not unreasonable to think you could hear the difference between high and low quality audio sources with that (since even high quality compressed audio tends to be less than 420kbit/s)

What has been heard cannot be unheard. Back in the day I did some ABX comparisons of various mp3 encoders. I unwillingly trained my hearing to spot encoder artifacts forever. I tested encoders more than 15 years ago. I still hear mp3 compression without trying. Bluetooth SBC codec is even worse. Wish I could turn this off but I can't.