Going to the term in the other thread, semiotics. The science of symbols and signs, etc.
Engraving starting off with Hey fascists, referencing a video game that is anti-fascist satire. It's all about spectacle, the 500kg is very cinematic and effective.
oh bella ciao bella cia bella cia cia cia is a lyric from Bella Ciao, a song sung by WW2 anti-fascist italian partisans and is recognized globally as an anti-fascist anthem.
notices bulges OWO what's this? (the fired casing) is a furry, anime roleplay meme.
"if you read this you are gay lmao." that signifies irony poisoning, turning murder into trolling.
Engraving the casing is myth-making, uncommon, but ensures people know the intent behind it and demanding interpretation.
"praised for how he engaged in political debate"
Charlie Kirk did not debate. He did crowd work. No moderator, he controlled the mic, a heavily prepared 31 year old vs random college students responding to the verbal equivalent of clickbait.
Charlie Kirk did one debate, at Oxford, against professionals with a moderator. He got his ass kicked, badly.