I haven't listened to Kyary since Pon Pon Pon, but I feel like at least back then she was being kind of ironic, with so much nonsense and cheery stuff that it was almost to the point of being grotesque. It's possible it wasn't on purpose, but it felt that way to me. But I'd imagine that if that was in fact her main 'statement' to be made, she'd quickly end up becoming exactly what she was trying to parody.
Again though, not a Kyary expert at all!
Anyway I love Strawberry Switchblade and I wish I knew why this song was only released on the Japanese version of the CD!