That's not what it says. It says they are acting like the Earthen who became Dwarves: All the Earthen who became Dwarves. They're mapping a set of symptoms, not making a cultural evaluation. You're talking like we don't already know that the personality changes they're talking about are well-established as being part of the curse of flesh.
All the Tyr reports are in direct relation with Yogg-Saron, who caused the curse of flesh & corrupted Galakrond. That's what connects them together. If your interpretation is correct all the Tyr logs are about how they discovered Yogg was infecting things outside its prison, except this one log which is about Dwarves for some unrelated reason.4 years in advance actually. They say they start working on an expansion as soon as the previous one is released.