I agree with @hiro666 that Style/Misc doesn't seem to apply.
As I understand it, that guideline is talking about "correct punctuation" as recommended by the Unicode committee and accepted typographical standards.
The other argument, that we try to match the appearance of Japanese titles as closely as possible? I dunno. I've got no opinion on that. Is that really the unwritten rule? I'm curious to hear other opinions.
If the goal is to match the appearance, it looks more like a middle dot or bullet to me, based on that fuzzy picture.