Wow, that’s…something new. We sure have no such restrictions around here. Moreover, I just checked one of my pending articles (about Typst), and it now has a draft-like version which does indeed still have a Japanese bibliography item (even though the font is completely different). I was afraid it would be removed or have tofu, but it all turned out to be just fine. So yeah, even Japanese in bibliography is OK, at least in that particular conference.
Now this can be a valid argument for the Chinese name.