Someone is trying to talk about the marketplace of ideas without reasonably engaging with Mill[1]. The positing of an idea being viable if and only if passing "peer review" is beyond ridiculous from a purely Millian standpoint. In his own words[2]:
> ...though the silenced opinion be an error, it may, and very commonly does, contain a portion of truth; and since the general or prevailing opinion on any subject is rarely or never the whole truth, it is only by the collision of adverse opinions that the remainder of the truth has any chance of being supplied.
I agree that CK was a political grifter (e.g. someone that found great wealth by partaking in inflammatory speech), but the marketplace of ideas allows for people like him to engage in any dialog he pleases. After all, TMZ does the same thing. Tabloids do the same thing. Tons of podcasts do the same thing. Hasan Piker, Destiny, Piers Morgan, Bill O'Reilly, and Alex Jones all do it, too. I may not agree with Charlie Kirk's politics or with his rhetorical methods, but I'll defend his right of free speech to the death.
> It requires shared standards of evidence, mutual respect, and actual expertise on the topics being discussed.
No it doesn't. This is a carefully-crafted contingency to ensure that you always have the higher ground via: "you're not an expert" (when experts can be, and sometimes are, wrong) or "you don't have the same standard or evidence as me" (when standards of evidence are often contextual).
[1] https://web.uncg.edu/dcl/courses/vicecrime/m3/part1.asp
[2] https://socialsci.libretexts.org/Courses/Western_Washington_...