Trump was not proved correct about the wiretapping. As you should recall, Trump publicly claimed he'd learned Obama wire tapped him at Trump Tower. That was a willful lie. He had not, in fact, learned that. In order to try to rehabilitate his lie, the usual Trump apologists have spent many months trying to turn up any surveillance that might have incidentally touched on Trump... they figure that right-wing drones are stupid enough that if they find something even in the ballpark of Trump's claim, the dummies won't realize that it doesn't vindicate what Trump said. Obviously, a warrant to conduct surveillance on Paul Manafort, due to his crooked Russian business ties, starting back in 2015, does not constitute Obama having Trump wire tapped, whether or not Trump may have incidentally been overheard as a result of his conversations with Manafort.
If it helps, consider it in a different context. Let's say I get on the phone with my cousin, who is a drug dealer. I don't realize it, but the FBI is listening in on my cousin's calls, because of that drug business. Would it then be accurate for me to say "I learned that Trump had my wires tapped at my home"? Of course not. That would be a lie.