Where I think this article goes a little wrong is the assumption that a RACI is about risk management. A RACI can tell you who is responsible for running the risk management process, but the R (responsible) and A (accountable), are not meant to move risk and absolve all others. They're just markers for "who is going to get this work done". They are about managing work, not managing the risks that can arise from that…
>A 10 on likelihood is "this is certainly going to happen", a 1 is "it very probably won't, but it could".
If something is guaranteed to happen it's no longer a risk, it's an issue, and then needs to be actively addressed to resolve it, starting by adding it to the Issues List. That effort is in contrast to efforts involved in mitigating the likelihood of a risk happening or its impact. E.g. it would likely justify reallocating resources to resolve the issue where, depending on the score of a particular risk, it might not. Also, in terms of reporting, issues are almost always reported to upper management regularly, whereas risks may not be.
Again, really good approach. I don't see risks managed explicitly enough, and I've been managing projects professionally for over 20 years.