And then He explained the parables for the hard of hearing.
The parables meanings in the Scripture aren't secrets and the Reformed don't have gnostic decoder rings.
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?