I've known him for a few years and he's been saying he's a part of Bungie for all that time but there's just inconsistencies with what he's saying so I've been very skeptical on him actually being an employee.
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#Help
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https://help.bungie.net/hc/en-us/articles/360049497451-Report-Suspected-Cheating-and-Poor-Behavior -> scroll down to 'Reporting Other Player Behavior'. If they've been saying it in game/on Bungie.net you can use those options. You can also use the cheater report form, despite its name, as it has a sub option under 'what specific behavior did you see that you believe to be cheating?' that says 'Impersonation, griefing, and/or toxic behavior' and you can attach evidence. It will depend on where the impersonation happened that determines the outcome.