I believe this paragraph is the relevant one
GPL'd assets can not be distributed in the same package as non-GPL material. It's kind of ambiguous.
GPLv2 Wrote:These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
themselves, then this License, and its terms, do not apply to those
sections when you distribute them as separate works. But when you
distribute the same sections as part of a whole which is a work based
on the Program, the distribution of the whole must be on the terms of
this License, whose permissions for other licensees extend to the
entire whole, and thus to each and every part regardless of who wrote it.
GPL'd assets can not be distributed in the same package as non-GPL material. It's kind of ambiguous.