Aren't the numbers known for being kinda "made up" though. So even if the sales are there they likely aren't accurate to the real thing at all.
This isn't a credible source for sales figures after all but to give a general idea.
From what we do know of his method of obtaining numbers, he gets information from retailers in order to give a rough idea of what the sales figures are. They weren't that far from the actual # in the grand scheme of things either, on top of that he would retroactively fix the numbers which makes older numbers a bit more reliable than your standard online source. It's not a site for credible numbers at all, but it's one of the better sites for, as you said, giving a general idea