I don't think that was a very clear question. Did they mean that Gaiman was "stealing" scenes from Miyazaki's movies to put into the movie adaptations of his novels, or did they mean that Gaiman took ideas from Miyazaki's films and inserted them into his books in the first place? Either way, my brow furrows and I try to think of some sort of example where that would be the case. Other than what you already pointed out about archetypes, I can't think of anything telling.

Also, I'm almost positive that Coraline pre-dated Spirited Away. And if Gaiman's blog is to be believed (I read it regularly), once the screenplay was out of his hands, Gaiman didn't have any creative control over how Stardust turned out.