I’m not sure I’d use the phrase “non-dual God”. God is God. Non-dualism has to do with our relationship with Him rather than with some sort of unusual conception of God.
The question I was raising in class is whether we are fundamentally or essentially something different from God, or whether on the contrary, at the deepest level of the human self, there is something “not other” than God—something (to use the language of the medieval Christian mystic Meister Eckhart) “uncreated and uncreatable”, a potency fully actualized only in the deified man, whom St Gregory Palamas said is “without origin” and “infinite”.
Rest assured: either way God is still “good”, though of course, whether we’re dualists or non-dualists, it’s important to keep in mind that His goodness cannot be reduced to what we think is good. “For my thoughts are not your thoughts, neither are your ways my ways, saith the LORD” (Isaiah 55:8). Remember, too, the ending of the Book of Job.