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.

https://www.wsj.com/livecoverage/charlie-kirk-shot/card/ammu...

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

Exactly, they're casting an identity and motivation on an as of right now, unknown suspect