The engravings in the bullets could be interpreted that way, but I have read from people more familiar with the groypers and how they operate that they love co-opting seemingly antifa messages and using them ironically as a dogwhistle. They are generally very online gamers who lurk in games like Helldiver’s 2 and use it as a nazi bar.
So the messages on the bullets seem innocent and left-coded to normal people but to someone sufficiently steeped in the shit-stew of ‘groyper culture’, they would essentially act as a sign, that one of their own people did it. It is very similar to an inside joke that kids have or things like skibidi toilet. By putting those particular in-group inside jokes on the bullet, the shooter was signalling to Nick Fuentes’s Groypers(essentially a gang) that he put the hit in on Kirk and TPUSA. So it seems to me like from this group context one could deduce that Kirk got killed by gang violence.
Kirk’s last words were literally ‘gang violence’. Coincidence? I think not.
Edit:grammar mistake
As far as demographics, they are pretty similar but most shooters have that in common here. Their methods are pretty much identical. Both climbed on a roof and shot. This shooter’s accuracy is a lot more neck than nick. Both in trump areas. Most recent one is more competent to since he shot and fled successfully. I would say unclear motivations aren’t that surprising for essentially kids who are shooting someone knowing they might die or lose their freedom. Also keep in mind government agencies are going to be selective in what they release since they are trying to prosecute in the future. Press outlets also are going to as well to cater to their audience and get clicks.