Then if God is untemptable, how could Jesus be God while in temptable human form?
In the same way that a geometric shape cannot at the same time be both a perfect circle and a perfect square, someone who can be tempted cannot be an untemptable deity.
Actually, a circle can be a square at the same time. It’s all a matter of perspective. Same with Jesus and God.
I think it’s a pointer to the fact that when we get to heaven, we won’t be tempted to sin as well.
Don’t claim to know the reason from God’s perspective. I’m just giving you a reason from our perspective.