I sincerely doubt that Moses was confronted by an existential projection of "being" when he first beheld the BURNING BUSH.
Men use the word "I" when expressing outprocessings of their own awareness....in faint reflection of God who uses "I" as well.
But you'd expect that of men...having been made in GOD's image and likeness after all!
I confess that most of this philosophical analysis of God is beyond me, and I guess that was the point of the answer that was givenby the former minister of our church.