“Not guilty” is distinct from “innocent”, and such a verdict, if a trial ever comes of this, would not impact libel or slander. Being unable to prove your accusations in court to the standard required is not a determination that the accusations were false, only that doubt remained.
It was a defamation case in which the courts determined that Trump made false statements by denying the allegations because he most likely did sexually assault E. Jean Carroll.
No criminal case was brought because it’s beyond the statute of limitations, and since the legal bar in a criminal case is higher I don’t think any prosecutor would bring those charges even if statute of limitations wasn’t an issue.
https://www.nbcnews.com/think/opinion/e-jean-carroll-sued-trump-defamation-last-resort-blame-statute-ncna1077321