I sent a first e-mail to HDtracks about a week ago to complain about the quality of the Santana album without any reply. I have sent them a second e-mail requesting an answer on my first e-mail. Got a reply asking to send them back my first question....
So their official answer is that HDtracks is just a reseller, they do not remaster any records and perform no over sampling.
They offered no excuses, no credit on future purchases, etc. They take absolutely no responsibility in the quality of the product they sell. This is so ironic for a company that bases all of its advertising on improving the audio quality of Red Book CDs when selling you their supposedly hi-Rez version.