The cover made me certain this was D@i, especially given the subject matter. In that image and often in the manga itself, I would have sworn Ueda's face was one of his.
I miss D@i's vision of Gensokyo.
Edit: Having seen the one other title on this site by this mangaka, and especially the Flandre cosplay, I suspect this IS D@i's new identity. It's bittersweet; at least he's not gone, but it's sad to know he's left his old stuff behind. At least there are backups of the galleries he nuked.