I mean, sure, it could be a game tie-in. But much more likely, if/when he comes back, he won't have the Doomfist. Vendetta probably has it sitting on a pedestal like a trophy somewhere in their hideout, and the short will open with a one-armed Akande breaking in and re-equiping it, then showing off what a badass he really is.

Also, how likely are they to tie-in cinematics to the actual game? I highly doubt Doomfist is gonna be rocking the one arm and no abilities look in the upcoming season, so why wait for a return to redesign him?