For a removed URL by Google DMCA report, how can report to google that the reporter of a DMCA request not copyright owner?
I am not a lawyer. I am not qualified or licensed to give legal advice. That said, here is my opinion:
Google has a process for DMCA claims related to it. File a counter notification with Google as described here, towards the bottom of the page.
If that doesn't work, you'll have to lawyer up as the DMCA process is kind of broken with respect to things like copyfraud.