Wow! And it's only been a few days since one with rank 30 was found.
Apparently the open question is whether you can achieve arbitrarily high ranks. And the username is "ranksunbounded" so presumably the answer is yes, and they're teasing it this way?
By the way, I really like this comment in the previous post that explain the surprise of the new result(s) https://news.ycombinator.com/item?id=49375870