By your logic, that would mean if Avril Lavigne, Good Charlotte, and SUM-41 say they are punk, then they are, in fact, punk.
Those five women aren't worthy of the "rock star" title. It's obvious. It's insulting and misleading to place them on the cover.
On that wonderful MTV2 24 hour thing with Courtney Love, she expressed her outrage of media's portrayal of rock music and females. So she played the Strokes as an example of new rock happening now. She played Heart as an example of Women that Rock.
Just cuz you bought into media's idea of rock, doesn't make it true.