The OwO thing is furry/gamer speak: https://en.wikifur.com/wiki/OwO
Its use is replete on reddit, and there's even a "Furry OwO" game on Steam. Trying to pass this off as groyper-coded is insulting to one's intelligence and incoherent, being at odds with the anti-fascist rhetoric he also used. (Simultaneously signaling "groyperism" and anti-fascism?)
If you really want to argue he's a "groyper," you'd do better to just admit the "OwO" thing is furry- and trans-coded, and consistent with the anti-fascist slogans, but that it's a false flag to be blamed on trans-furry Antifa types meant to inflame moderate Republicans of the sort Kirk represented to drive them further to the right for the sake of accelerationism. Of course, that would be easier if you weren't also trying to paint Kirk as so extremely rightwing that we ought to breathe a collective sigh of relief that he's gone, as if one of Hitler's top henchmen was just taken out by a partisan.