It’s an interesting chart and the loudness wars have not clearly not been good for music.
However, I have a non-loudness war observation: Unless you have a listening room with a low noise floor and in which you can listen at concert hall levels, classical music can IMO be unlistenable unless it is dynamically compressed* during replay…
* “dynamically compressed” includes continuously adjusting the volume with the remote so you can hear the quiet bits, whilst responding quickly to huge volume changes to avoid provoking the ire of the family, neighbours, etc…
I find this the case in the car, but in my living room, it is less of an issue for me. I may need to turn it down a bit during crescendos and/or up a bit during quieter parts, but not unlistenable.