The author only needs to show up to court with a driver’s license to prove their identity. The judge would rule in favor of the author the same day if someone from Google actually bothered to show up.
A scammer isn’t going to court. Don’t try to solve for that.
Google being informed by the copyright holder that it's for sure pirated is pretty good evidence that they know it's pirated.
The fact that this doesn't scale isn't really a legal defense.