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More than likely he was hacking. Report him for cheating in game and view his gamer card and report him for cheating there. Add a comment to the report that says "possibly hacking in blops3. Very suspicious gameplay."
At least have the title creator watch him in theater before assuming he is cheating. A good player who stat reset should be the first thing that comes to mind, not that this score is impossible for anyone but a cheater.
I can't say I've seen anyone cheat on the xbox 1 version of the game yet. I've seen the jitter mod, which is more of a modded controller. And I've seen people one-hit kill with automatic weapons before, which was suspicious as hell. But there was never really a lot of proof surrounding that one. So I'm still not convinced xbox 1 has been broken yet.
I'm not surprised that someone is capable of going 42-0. But 42-0 on that clusterf*** of a map known as Nuketown? Not saying the guy was hacking, but to me it would take some real serious skill to go 42-0 on Nuketown.