In a manner of speaking, he’s right. God doesn’t act, per se. (Action implies prior inaction, and stimulus, and response, doesn’t it? And that would imply change within the actor, wouldn’t it?)
Instead, it’s more accurate to say that God wills. His will is eternal and unchanging. Moreover, anything that we perceive of, within the confines of time & space, as being an ‘action’ of God, is instead, in fact, an example of God’s eternal will being actualized in the framework of His creation.
So, would we say that God ‘waited’, and then ‘acted’ in 1 A.D., causing the incarnation of His Son? Nope. Rather, God willed the Incarnation eternally. We experienced the Incarnation, as time-and-space bound humans, as an event that occurred at that point in time.
Hope that helps…!