Publishing a false statement of fact that results in damages to another party is a tort. Nobody is contesting that. But your application to these facts is rancid.
First, the statement is an opinion. One does not have to expressly state that a statement is an opinion if it would reasonably be understood as an opinion. Courts have and would bend over backwards to dismiss any claim over OP’s statement at summary judgment because to punish someone for speech that only the shriekiest of Karens would fail to understand as an opinion, simply because it doesn’t contain certain magic words, would have too much of a stifling effect on speech. Here, it’s an opinion because there is evidence of an act that is subject to interpretation. Ones opinion of murder does not have to conform to any specific state’s law, as we’ve seen here when other recent cases resulted in a conviction that people refused to accept. The opposite also holds true. OP does not have to choose between accepting the verdict or paying defendant for his opinion.
Second, even if that weren’t the case (it is) a jury verdict finding Rittenhouse not guilty is not controlling on a civil jury. Rittenhouse could present an acquittal as evidence that the statement was false, but it would not be controlling on the jury and the defendant could absolutely relitigate Rittenhouse’s guilt with available evidence and the civil jury could come to a different conclusion. (Which is essentially why the statement is an opinion in the first place.)
Third, your cases do not support your statements. Sure, they establish that defamation law exists, generally but, again, nobody is saying that’s wrong. The facts are absolutely nothing like what you’re saying. Jesse Ventura was never acquitted of being punched in the face by Chris Kyles

and Kyles’s defamatory statement could not be understood as an opinion because it was a detailed description of an event that never even took place. Likewise, Sean Penn was never even accused of domestic assault, much less caught on video punching any of his wives (also it was never litigated and was settled with a charitable donation and a public apology).
Just saying that he could be sued for that is not the dumbest thing I’ve read on here, but it’s pretty asinine and arguing about it on and on and thumping your chest over some case law that doesn’t even support what you’re saying brings it into contention.