Accusing someone of spousal abuse and attempted murder, without a scintilla of evidence, is more than a mere dispute over facts.
You may have missed that part. As you know it's OK to speculate about the possibility someone commited a crime without knowing specifically that a crime occurred or that the target of the discussion was involved.
Otherwise, no one would ever report a crime or a suspect!
Ergo, such discussions only rarely could be considered libel or slander in the law. Doesn't mean it doesn't happen, but you'd have a difficult time pursuing a claim (at least in the USA).
In the end we are left with what is, at worst, a dispute over what facts count, and what facts don't count, in a very difficult case extending over nearly 2 decades.
You already know my dispute is with Florida's fascist law that says you can deprive people of water. That's a very dangerous law.