As seems to be the case many times, Twitter name that gets auto completed when you upload from one of their Twitter post URLs doesn’t match their actual artist tag.
This redraw was posted on their Instagram with the new name, and the original was posted on DA with the old name. I can’t find any links definitively connecting the two, especially since his Twitter has been suspended, but I’m pretty confident they’re the same person.
artist:di youyou -> artist:狄优优
I think “artist:di youyou” is a Romanized variant of the other tag. I don’t see anywhere that the artist calls themselves Di Youyou and not the Chinese alphabet equivalent.