That is how understand it. I believe the angel of the LORD to be the LORD. [Exodus 3:2,]
I understand that belief, and agree that in some places the use of “The Angel of the Lord” may be a pre-incarnation appearance of God The Son.
Let’s look at the passage another way. What was the purpose of God commanding Abraham to sacrifice Issac? Was God trying to learn something about Abraham He didn’t already know? Or… was God revealing something about Himself that Abraham didn’t know?
Hebrews 11:17-19 tells us that answer. It says that Abraham offered Issac believing God was able to raise him from the dead. I don’t find any reference in Genesis of that belief.
Remember, on the way to the place of sacrifice, Abraham assured Issac that God would provide a substitute sacrifice. Abraham knew God had promised his legacy (promises) would come through Issac..
It wasn’t until the moment came to make the sacrifice that Abraham realized God would raise Issac from the dead to fulfill His promises and made the decision to make the sacrifice.
It was at that moment, when Abraham realized God could raise Issac from the dead, that He stayed his hand, saying “now I know…”
The “Now I know” statement not that God had learned something new about Abraham that He didn’t know before but that Abraham had learned something new about God and that God’s purpose in commanding Abraham to offer Issac had been accomplished.
That’s what I believe
peace to you