I think he's referring to this:
16From His fullness we have all received grace upon grace. 17For the law was given through Moses; grace and truth came through Jesus Christ. John 1:16-17
He probably means what you have said about it:
I suspect he would agree the grace of God in this New Covenant is not given so murderers and rapists and haters, condemned under the covenant of law, can continue unabated to be murderers and rapists and haters in this New Covenant of grace.