We don't have proof that Joannides knew about Oswald before the assassination-only after.
Given that Oswald's confrontation with Bringuier made the local news (plus Oswald requested to speak to the FBI while in police custody) and they also had a radio show appearance together, the odds that Joannides had no knowledge of Oswald prior to 11/22/63 are very low.
Bringuer also noted that he reported everything that happened with Oswald to the DRE leaders in Miami who reported to "Howard".
Unless Joannides was bad at his job, we can assume he read Bringuer's reports and had heard of LHO before 11/22/63 via other information sources.
One or two of the members said they told Joannides about Oswald. That is all the evidence we have on that. But even if they told him before, there is no evidence that he thought much about it or did anything about it. And nobody says that he did. That is why it is a nothingburger.
We can agree that none of this information directly connects Joannides to JFK's assassination if that's what you mean. Even if LHO was wittingly or unwittingly part of the CIA's campaign against the "Fair Play for Cuba" organization, it doesn't prove the CIA was complicit in JFK's murder.
I'm fully aware of that and am not arguing that this is some sort of "Smoking Gun". I don't think Jeff Morley is suggesting that either.
But it does however raise questions about what else the CIA has lied about in the official records.