You are completely wrong. Even HDMI 1.1 has enough bandwidth for 24-bit 192 kHz 7.1 PCM audio. I have been using it since 2007. Apple’s version of hi-rez lossless is limited to 2 channel stereo only and that is possible even via optical and coax as well as USB.Could be wrong but I’m not even sure if HDMI 2.0 even has the necessary bandwidth to output high res.
My interpretation is that is does not and we will never get the feature.
It does support lossless audio though so that should give you CD quality.