This is incorrect regarding UK law
Firstly the plaintiff must satisfy the judge that the specific act of defamation could have caused actual harm to their reputation. (This is probably the cause of your confusion, but it's a new bit actually intended to make it harder to sue for defamation/libel than before). If they don't do that, there's no case to answer even if the claims were tendentious and malicious.
If the plaintiff succeeds in that claim, the defendant can attempt to use the defence of honest opinion (or alternatively prove that on the balance of probability that the claim was true)
Obviously that's a tougher law on defendants than jurisdictions where the plaintiff has to prove that the claim is false and prove that the defendant knew it was false, but it's still quite easy to intentionally harm people's reputation by publishing things which are true, or simply a matter of opinion about their general character.