Why does only section 4 apply and not section 6? Is there case law resolving the situation, or are you giving your interpretation, or ...?
Sure, it's an interpretation.
[edit] the point is: nowhere as clear as the original comment expresses.
But this is a policy argument, not a legal one, and it will absolutely never win in court over very clear and unambiguous text.
This is, as i said, why GPLv3 was revised here.