That factory is apparently still producing disks based on the dye and equipment bought from Taiyo Yuden, they weren't chosen because they couldn't keep up supply. The quality between TY, CMC and this factory is apparently near identical according to their quality comparison charts.
PS. I may be getting some Ritek TDK DVD-R soon so I'll be able to prove that one in the next few weeks!
As for the TY rumor, I guess we'll never find out. If it was proven it would destroy TYs reputation!