You didn't link to the study; you linked to the PR release for the study. This and this are the papers linked in the blog post.
Note that the papers haven't been published anywhere other than on Anthropic's online journal. Also, what the papers are doing is essentially tea leaf reading. They take a look at the swill of tokens, point at some clusters, and say, "there's a dog!" or "that's a bird!" or "bitcoin is going up this year!". It's all rubbish dawg
An AGI could microwave a burrito so hot that not even the AGI, in its omnipotence, could eat it