Thomas must be exhibiting the scent of Christ from scripture (2 Cor 2:14-16).
That’s what Van Slyke is responding to.
14 But thanks be to God, who always leads us in triumphal procession in Christ and through us spreads everywhere the fragrance of the knowledge of him.
15 For we are to God the aroma of Christ among those who are being saved and those who are perishing.
16 To the one we are the smell of death; to the other, the fragrance of life. And who is equal to such a task?