It's not unreasonable conclusion if you believe some of the stuff WSJ is putting out claiming the ammo/rifle had common leftist interest topics on it like anti-fascist and transgender interests, but those articles could certainly be a hoax or that evidence put there to throw off police.
none of this information was available when these comments were made. Essentially the entirety of the right-wing media apparatus had already made up their minds before any evidence was available
https://www.wsj.com/livecoverage/charlie-kirk-shot/card/ammu...
https://archive.is/kLymA