As far as I can see, he is guilty as charged. The claimant quoted from Murray's blog and Murray called him a liar saying that he (Murray) had never said what he did say (I went to the blog post in question and the quote is accurate).
Having said that, I really don't see how Murray's comment in a lively TV debate is going to materially disadvantage this Jake Wallis Simons person and I assume that is going to be the central plank of Murray's defence. And I do agree that something needs to be done about the iniquitous costs involved in defending (or mounting) a libel case, but I have no idea what.
I don't think he is guilty as charged.
The line in the blog is "with an aggressive theocratic overlay that claims tribal superiority over the entire rest of the world."
Jake Wallis Simmons claimed live on Sky that Murray's blog said "Israel, quote "claims tribal superiority over the entire rest of the world.""
I don't think you can say "Israel" and "an aggressive theocratic overlay" are synonymous. So Simmons was mis-quoting from the blog. Also Murray starts his sentence on his blog talking about "the concept of Israel", which I think is a very different subject to talking about the actual Israel.
Not sure which claims Murray was referring to when he said an aggressive theocratic overlay claims tribal superiority. Theocratic claims to tribal superiority could be referring to the claim that the Jews are God's Chosen People e.g. Deuteronomy Chapter 14 "For you are a holy people to Hashem your God, and God has chosen you to be his treasured people from all the nations that are on the face of the earth."
And I am not sure what Murray meant by "the concept of Israel".
My view of the Zionist concept of Israel is the notion of Jews going to Zion (the hill of Jerusalem) to attain majority status in the area and, ultimately, political independence and statehood.
The concept involved carrying out unrestricted immigration of Jews into Palestine, whose ancestors had lived for hundreds of years in different parts of the world and had no ancestral claims to the land. The Jewish immigrants ignored the immigration restrictions preventing them from settling in Palestine and forcibly create a Jewish homeland owned by Jews, at the expense of the native Arabs. Of course other people had carried out similar acts of colonisation and appropriation - the Ottomans, the settlers in America and their treatment of native Americans etc. The Arabs managed to revolt against the Ottomans but the native Americans ended up on reservations.