I recall using Pink Floyd-DSOTM. Sacd has a dynamic range from 70 dB to like 110 dB. Cd was something like 80 to 98 dB. DTS was somewhere in between, vinyl of course which I don't have would be less than cd.
I think this is complete misinformation. In my experience, vinyl is usually significantly more dynamic in application than CD or SACD.
So, I went onto the dr. loudness-wars website to see what the actual numbers are for that album. If you look at the database, the CD can be as bad as you say, but the SACD is no where near 40DB dynamic range, more like a quarter of that.
It actually has worse measured dynamic range than the myriad of vinyl rips on the database.
People assume that because digital has a THEORETICAL higher dynamic range than vinyl, that it actually matters in real world application. The truth of the matter is, that often times, especially with albums recorded in the days of vinyl prevalence, vinyl has the upper hand in dynamic presentation because of the mastering.