Paul has denounced 9-11 truth theory, many, many times. Fred, by contrast, has never recanted his support for putting that Marxist thug Aristide back in power. At first, he tried to falsely claim he only opposed the "embargo." He gave that up (though never recanted) after the form he himself signed supporting Aristide's restoration to power was publicized.
No he hasn't.
He has definitely said that he disagrees with some of it, he has elliptically hinted that he may agree with some of it, and he is still a favored candidate of Alex Jones and other hardcore Truthers.
Had he definitively repudiated Truther conspiracy theory, Truthers wouldn't be backing him - it is, after all, their only issue.
To be honest, I'm not that concerned about one incident concerning Thompson's lobbying 16 years ago. Particularly since restoring a freely elected official to power is something Paul might support. He'd certainly have been opposed to deposing him, twice.
We're lucky we haven't had trouble with Haitian suicide bombers.