lol. That's not what Christ says at all. Neither His parable nor His explanation was not heard by those not given ears to hear. And thus He didn't heal them.
This isn't rocket science. It's written in black and white. Doesn't it worry you that it seems to be more important not to agree with a Protestant than to actually understand Christ's words?
No, that's what He did. Told a parable, they asked, He explained. Now both parable and explanation are there for us in Scripture. And further, Jesus revelation, written and not, is the Deposit of Faith of the Church.
Some can "hear" some can't. Some hear some, some hear more. Some don't hear today, but hear tomorrow. Grace, teaching, scripture, praxis, faith, the sacraments. Available for all, not secret.
Not some magic double predestined special coded gnosticism.
Going by YOUR criteria, Christ was speaking to Jews, not gentiles. How could any gentile possibly have ears to hear. And what is a triple negative with a verb and subject which do not agree ("Neither...nor...was not heard...those not given) doing cobbled together? Gibberish is about right.