That's not much of an argument and "successful" is pretty subjective. Many teams have found issues where vendors have claimed otherwise, very common with mongodb and elasticsearch.

There are also thousands of problems that happen with no public reporting and no vendor is going to willingly release details of their support cases, especially when they're being paid to fix their own problems.

There's nothing but positive outcomes from jepsen and holding databases to strict standards to see if they actually meet the goals they state.