Thanks for the patronising but in 2017 I was working as a civilian police investigator, for years combing CCTV was literally MY bread and butter. Even if I hadn't been, I don't think anyone with half a brain cell would think CCTV has only come into existence in the last 8 years (and ironically it was also "very much a thing" in 1996 as well, and much earlier!)
What I meant was, any relevant CCTV would have been gathered and reviewed at the time, and any that wasn't would have long been overwritten. It's highly unlikely that someone would randomly 'find' CCTV footage from 9 years ago that had a) been retained and b) hadn't been requested in the initial H2H scope/media furore. Another type of footage like dashcam or whatever is slightly more likely, but the vast majority of CCTV has very short retention periods. People have suggested 'AI' and 'pattern recognition' but it's not really clear how they think that would suddenly solve a long dormant case.
Your average person doesn't have a great idea of how exactly CCTV works. See the first Richard Osman novel where the culprit's car reg was identified 'by ANPR.' The whole point of ANPR (Automatic Number Plate Recognition) is that you need to know the numberplate FIRST and the camera then picks up that reg.