That was what stuck out to me from this, too... sounded like "nyanyanyana, I found a critical bug in your product - but I won't tell you what it is"
I'm sure that Riak has bugs too - there are very few software products that DON'T (the provably-correct C compiler CompCert[1] being one that shouldn't). But it seemed to me that the post's author was simply trying to avoid getting sidetracked.