Not sure how it works in Croatia but in most of the civilized world in order for defamation or libel to be proved you have to prove the person you're suing knowingly told a lie with intent to harm. As in, saw overwhelming evidence that what they were saying was untrue and still said it. His whole defense is "my word against theirs". The problem is that he will have to prove to a judge his word is good enough. The sum of a trial would be a lawyer showing numerous times that Lloyd lied so therefore his word can't be taken seriously.
There really isn't much to the case other than the two key questions before a judge. First being, do the defendants have reasonable cause to believe Lloyd was seeing prostitutes in Thailand? Well, he himself admitted to using prostitutes for years. he admitted to "dating" a "sex worker" in Thailand. I think most judges would find it reasonable for many to assume that yes he in fact did use a prostitute in Thailand. With that, it's also perfectly reasonable to speculate that any prostitute used may have been trafficked. It's now up to HIM to prove all these are not true in order for anyone to be found guilty of defamation or libelous.
The second is if Lloyd is a "public figure" so therefore, defendants are immune from criminal liability due to the extremely high bar that comes with that. It would be easy to argue that this sort of talk is protected as "free speech" (Croatia has a carve-out specifically for this). Lloyd can't claim he makes money as a public figure and therefore is entitled to X and then claim he isn't a public figure so should fall under the laws for a private figure.
It won't go to court but if it did I think his biggest issue would be Dijana. I think that has been his biggest fear all along. She knows all the secrets. Get her in a deposition and watch how fast Lloyd would likely drop the case. I suspect that is why he kept playing really bad defense on this trying to get ahead of it. He knows Dijana talked.