Story is very fresh right now with several outlets blowing it up as a 'we won!' moment and AOC calling for his arrest for incitement or some shit.
He needs to do a Rubin or something similar as he was the one thing that made people even watch fox sometimes because of his anaylsis. I sense Fox's viewing figures are going to dive again...
The straight legal answer is that it matters that the Fox News personnel didn't believe the Dominion allegations but aired them anyway. What makes proving defamation so difficult, particularly in the case of matters of public interest, is that it requires actual malice or reckless disregard for the truth. Without that evidence that the Fox News personnel didn't believe Sydney Powell and her allegations, it's a near slam dunk case for Fox to say they were just covering all sides.
They already had discovery -- that's where the internal communications from Fox News personnel were produced. Having reviewed discovery from Dominion, the judge stated it "is crystal clear that none of the statements relating to Dominion about the 2020 election are true." It's very possible they still win. But, it would have been a Delaware jury and a giant spectacle with their stars being brought in to testify. It also works for their general transition from Trump.
What kind of internal communications?
E-mails and text messages.
Here is Dominion's brief in support of their motion for summary judgment that includes the communications they were relying on (although not the exhibits themselves):
https://archive.is/XcO64
I don't know if that archive link actually lets you go through the PDF, but here is the direct link: https://int.nyt.com/data/documenttools/redacted-documents-in-dominion-fox-news-case/dca5e3880422426f/full.pdf
Well that's really damning, but doesn't it mean the Fox execs pushed him to read his stuff about it while making his meme faces?
Or did he find out only later?
If you read pages 18-25 of the Brief (31-38 of the PDF), they suggest that they didn't want to cross Trump and that because Fox News had pissed off their viewers by calling states early for Biden, they were worried that they weren't giving their viewers what they want to hear. I think Tucker was trying to let people make up their minds about the accusations but he didn't believe them. But, yeah, the evidence in these communications is quite bad and would look even worse through examination in court.
what did they say about Dominion? Nobody talked about that. They just kept ragging on Tucker for being two faced.