Claiming that parents are lying about their murdered children seems like quite a harm.
There would be a big difference between Jones saying "the shooting was fake, it was a hoax" versus "that father on screen, John Smith, is a liar and an actor and doesn't even have a kid plus he's probably a pedo".
Well, which is it? What did Jones actually say about Sandy Hook? That seems to never get reported.
It gets reported all the time. It's both. Jones has said the shooting was fake/hoax, and Jones has called the parents liars and actors and said that they were making up the shooting for financial gain. In other words, libel.