I wonder if it's just that they only show the two numbers if a comment has downvotes? It would be a weird UI choice but I can see it happening, since technically you're not missing any info, it's just that the user doesn't know about the information they're not missing unless they understand this detail. It would be clearer if they were shown on all posts.
EDIT: Yeah that's the answer, look, you can test it by downvoting your own comment (or I guess someone else's but don't do that you meanie poos):
EDIT 2: This is now old info, it looks like this has been changed in the latest update lol. Fast-changing times we're living in.
It's not only a kbin thing. Votes from Lemmy are still not anonymous. You can see who downvoted and upvoted any post from kbin, even if the voters were on Lemmy.
Even if kbin was to hide this information, it would still be sent from instance to instance. It'd be harder to see, but still accessible.
(From what I understand anyways)
I read through some of that link and the problem doesn't seem likely to be fixed anytime soon. But I didnt read it fully because it didn't look like it was going anywhere.
And is that......a problem? If true, it would help the community detect brigading ad vote manipulation, without having to rely on admins to do it for us.