well lining or yy doesn't matter, its just a brand. OEM from some manufacturer. you can get it cheaper on other brand, its just cheaper thats all. Hope this helps.
I also thinking Lin Dan still using YY AT700. Li Ning Wood N90, the 10-2 o'clock of the frame is dark colour, the one Lin Dan using in Sudirman Cup was pure white and it really looks like AT700.