Gaffer, I agree with your conclusion — the case cited by joesbucks won’t affect Trump’s appeal — but I do so for a different reason.
SCOTUS had already established that a verdict of Guilty in a criminal case must be rendered by a unanimous jury. The issue in the new case was retroactivity: Where there were people sitting in prison because of non-unanimous jury verdicts that had preceded the SCOTUS decision, were they entitled to a new trial? A divided Court held that they were not.
This will affect Trump only if, between now and any later appellate decision, there’s a similar CHANGE in the law. Something that was permissible in May 2024 becomes impermissible.
I haven’t heard of any prospect of that happening. In the OP by Lazamataz, he makes arguments based on existing law. Those arguments will stand or fall without regard to the question of retroactivity.