One can here the gospel and receive the Holy Spirit in any way God sees fit. It doesn't have to be the hearing of words spoken from the lips of men, or even those words read from scripture....technically.
Are you really trying to say that Calvinists of any sort haven't heard the Holy Spirit because they haven't believed the gospel?
And if so, what is the gospel which you insist they have yet to hear and believe?
Peace
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What is the Gospel?
The Gospel is that work that Jesus did in our name and on our behalf that justifies us, Romans 3:26.
In our name and on our behalf Jesus fulfilled every jot and tittle of God's holy law, Matthew 5:18.
That was not enough, something had to be done about our sin.
"For he has made him to be sin for us, who knew no sin; that we might be made the righteousness of God in him' 2 Corinthians 5:21.
Because of the doing and the dying of Jesus we can stand before God in the judgment as justified.