Barring typos, the RAW can't be wrong. It can be misunderstood, or read differently but it can't be wrong.
I'm not saying the RAW is wrong, I'm saying the place in the ARG is wrong when it claims to say the RAW is one thing, when it is not. The ARG is claiming the rule was already something. It was not, and it is still not. That is a mistake, pure and simple.
Matthew, how do you read the rule within one specific creature type as applying to other types? That's not misreading or fuzzy, that's changing the rule. Period.
The rule in question was not fuzzy. It was clear. It just wasn't what they wanted it to be. As a result, they decided to change it like they did many things. This is great, except they didn't actually get around to changing it. It got forgotten. That's really understandable as there were a ton of changes made.
They have the ability to further change these books. And there are a great many things in these books that need changing. This change would be a very easy one. These changes and the commitment to quality is what drew so many of us to them in the first place.
They are, however, unwilling to continue and make even simple fixes. They would rather let the books conflict with one another. Worse, they have an easy and frequently updated list of FAQs that they are misusing as errata.. and aren't willing to even do that. This is not the Paizo that I've lauded in the past, and it saddens me.