Good video by someone who knows what they're talking about.
Summary? Nargh, watch it yourself.
Interesting points raised that stuck in my memory after watching...that Hi Def should equal or exceed the human ear's specification. He does not consider analogue tape, vinyl, dsd/sacd or cd to offer anything beyond what he would call standard definition, and he argues convincingly to justify his POV.
That the DR site ratings are meaningless as the whole track including fade-out is assessed, and thus skews the DR rating - readings should be taken after start to before fade out when he says they'll be a more realistic 6db or so.
That "master quality" flat transfers of classic albums should be offered, and we could all just remaster them ourselves to taste using mobile phone computing power. That HD versions of classic albums, even from a good analogue source, are not HD....