I think his logic is right, but the premise might not be true. I believe that many people still googling docs and answers even though they know the exact location they are. Google (or search) is just quicker.
That's what I meant. Reasoning that something is searched for less frequently, because people know where to find it and do not need to search for it, is valid -- I just do not see (and the poster I replied to did not explain) how this applies only to Rails and not to Django. Had he referred to specific attributes of Rails, that make people not need to search for it, it would be plausible. Alas, he did not.
I think it is the poster mean - it is not sufficient to show which framework has more user by looking at google trend, that applies to both rails and django. Though I think Google trend and number of user is causal relationship.