That his court case will succeed is a vain hope. Even if it did, there will be no repercussions except it would let him 'crow' his innocence.
That's the gist of it. Notice that he tries to gloss over the actual consequences of the case, assuring everyone that the court can find against someone who doesn't bother to show up to defend themself. That's pretty much the extent of the consequences- you'll be 'convicted' in absentia of insulting someone across the internet. Actual consequences? Nothing.
And I'll point out again, that he does not want any of this stuff actually tried in court, with defendants making a case and cross-examining or deposing him. He can say what he wants in a Twitter rant or Facebook post, but it would be very different facing an actual lawyer, asking him questions that might actually put him in his own legal trouble.
One curious thing that he points out as "obvious" is this:
When you defame someone it isn't their job to provide a point-by-point summary of how you have defamed them and/or help you fact-check your defamatory content to make it more agreeable.
Actually, it is exactly like that. Unless the Croatian courts use the standard of 'guilty until proven innocent,' you do have to prove your case to either a judge or jury. Same with a civil case. And you are indeed expected to provide the defense with a summary of the case you intend to make, again unless Croatian courts allow plaintiffs to ambush defendants with a lawsuit.
Again, I have to wonder if this "legal team" exists outside of his mind.