He said it was put back online after 15 days. That's how it's supposed to work. There is a gap between the content being taken down and going back up to allow time for a copyright holder to go to court and get an injunction.
It would be nice if Google would let submitters to provide (and honor) a OnDMCANotice event handler, so the counter-notice gets sent inmediately, maybe documented with a reference to IP registration.