Tip of the iceberg.
They think God's grace needs more grace to work. God’s gracious words need not a magical working or be infused with some supernatural inner grace to have their intended effect. They simply must be clear and understandable.
The supernaturally inspired words of the gospel are sufficient to accomplish their biblically stated purpose without an additional supernatural working. Mankind has been created by God with the basic capacity to hear, understand and respond to clearly revealed truth. Those who do respond negatively to the clearly revealed truth of the gospel are not somehow morally restricted from doing otherwise or dead.
The natural man who is alive and deems the things of the Spirit foolish do so by their own free moral choice, not by an innate necessity which is beyond their control. Total depravity is wrong by teaching every human being is corrupted by sin in every aspect of their nature, making them unable to choose God or seek salvation without His direct intervention.
Does it make much sense to teach that mankind is born in a kind of fallen condition that makes them unable to even respond willingly to God’s own powerful and gracious appeals to be reconciled from that fallen condition?