In that interview, he used one word answers for that part. Trump did not sign the Insurrection Act of 1807, until such time there is an announcment that he did. That announcement will come when it comes (some reports that it will be General Hyten that announces it), according to an operational timetable that none of us are privy to, and while Flynn may know, he won't say so. At the end of the interview you point to, there was a discussion of a wine bet where Flynn recommends Doug not concede yet. Contrast that with his one word 'No' answer earlier in the interview.
The scuttlebut I follow indicates the Insurrection Act was indeed signed on Jan 10. Take that as you will... YMMV.
Flynn is not Q and not near the "top of Q". Q is about 10 folks, a "Q-Group", whose names will never be public. I've heard that most are military, however some are civilian. That's the inner ring with the highest secret clearance. More outer rings disseminate a mix of news and psyops. Hard for folks like us to discern between the two - indeed hard for anybody that we may be hearing this stuff from as well.
...since he was not alive at that time and therefore could not possibly have signed it.
You mean "invoked."
Regards,