I mean, I get why they're releasing a summary infographic. The fewer details they release, the fewer things they're vulnerable to lawsuits over. But at the same time, I do think that it's important for society as a whole for companies to release the root-cause-analyses when their products have caused harm, so that other companies in the future know exactly what to watch out far and what sorts of designs to avoid. Right now, there's nothing preventing some other phone manufacturer from making the same mistakes as Samsung, with the same results.
However, it does look like in this case additional data from a few regulatory or quasi-regulatory agencies has been provided (PDF links after the infographic), and the infographic is reasonably detailed.
In this case, the "root causes" are not terribly interesting. The cause for the high weld burrs is that the settings on the welding machines were set wrong. If they said "the settings on the welding machines were set wrong", or the root cause for that ("our battery technicians were incorrectly trained"), that would have been useless.
In contrast, this is a fantastic explanation, presented in a very clear way. If I was running a battery fab, I'd be able to check for these problems in 20 minutes.
Further in the favor of Samsung is that battery fabs are some of the most opaque places in the world. They never release any information of any value whatsoever to the outside, and there are only a handful in the world. For Samsung to release something like this so candidly is absolutely unprecedented in the world of batteries; I was shocked when I saw the post.