Information on an item of knowledge is not knowledge of the subject matter itself.
See Taking Note:
It’s interesting to see that he makes a distinction between knowledge and meta-knowledge, calling the latter “information.” It’s also interesting to see that since 1775 the second kind of knowledge (meta-knowledge, that is) has increased almost exponentially as compared with the first kind. Some people lament this. I believe that it is an inevitable byproduct of the growth of knowledge of the first kind, and therefore not to be lamented, but to be better understood than it is even now.”