They've been gone for about 5 years now.
All Maxell-manufactured discs ARE good. The guide is correct.
The problem is that Maxell-branded media is not Maxell-manufactured media anymore. That's where the distinction lies (and is why that guide even exists, to spell out that brand is non-important).
Maxell-branded discs might be CMC, RITEK or something else.
Buy.com is probably a good eBayer, being a large store that seems to use
eBay as an added storefront. Not like those fly-by-night operations (Joe's Blank Discs).
Maybe some disambiguation disclaimers can be added to the guide, reminding people that Maxell and TDK discs are just brands now, manufacturing ceased long ago.