I think that an anime tie would be big, but it'd have to be the adaptation of a very famous manga or something. But I don't think it'd be necessarily degrading for Ayu for perform at an anime convention. Pssh. Nana Kitade did it and I respect her very much. Gackt also did it, as did Miyavi, Sugizo and Yoshiki when they did the S.K.I.N. gig.
But whatever, it's probably not true considering it came from a Chinese source. Also there's the annoying habit of ayu.no bringing in false info...