Bought the album on hdtracks day one and got mad about crazy dynamic range compression. Then I started playing with blu-ray 5.1 LPCM mix trying to convert it to stereo, without even checking the stereo 2.0 mix first, thinking that's where hdtracks sourced it from.
Here's the way I did 5.1 to stereo :-)
Rip the audio to 5.1 FLAC files.
In Audacity, set front L+R as stereo, set back L+R as stereo, C and LFE as mono. Export audio as 32-bit float 96KHz WAV. Open the new stereo WAV (which will look brickwalled, then amplify to 0db, a trick I learned on youtube.
Export as 24-bit 96KHz FLAC
Still sounded better than hdtracks.
Then I found out that LPCM stereo tracks from blu-ray actually sounded good, which I kept them as FLAC for main listening experience.
Sent hdtracks an email.