I think this whole thing would've worked a bit more if Uruma had any inkling of doubt or remorse before the flashback. But of course since he has already killed dozens and not even the parents of his victims have faced him, there should not be any change if this whole thing is about how "he kinda started it, kinda, probably, not completely sure, definitely not 100% his fault".
A good proof of this is if this choking scene was done by ANY other character, it basically changes nothing.