By your reasoning, the fact that strings are mentioned in the manual page supports the notion that strings are only a concept for humans, but are not really part of the Perl language.
Suppose I had claimed that birds are black. And oshalla disagrees, and shows pictures of ravens. Now, that wouldn't support his case, would it?
If I say that lists are a concept for humans, and someone shows the manual page - which is intended for humans - mentioning lists, than it only supports my claim. It doesn't follow that my claim is true - but it certainly doesn't disprove it.