As soon as God chose not to say, “no that won’t happen,” it became His plan.
A Grandmaster chess player does not mandate the choices of his opponent, even though he acts to prevent some of the tactics of his opponent. The one playing against the Grandmaster is free to choose his moves, to mount any sort of attack he thinks will lead to victory, even though the Grandmaster may cut off certain strategies and maneuvers with his own moves. It doesn't follow, then, that when God prevents something from happening, He has shaped all that has happened to that point or will happen from that point. He can stop our plans without entirely co-opting them.
If you want to get technical ALL suffering is the result of his choice to put the tree in the garden.
No, it is the result of the choice
Adam and Eve made regarding the Tree. The Tree had no power to harm so long as A&E avoided it, as God had commanded. If the Tree had not been in the Garden, Adam and Eve would have had no real choice to disobey God, their obedience would have been forced by circumstance, not the result of a free choice to love (and so obey) their Creator.
ALL of the problems on this earth flow from that decision.
No, they flow from the free choices of people not to love God.
He knew what would happen and chose the path that would cause innumerable deaths and billions upon billions to burn in Hell for eternity.
No, all who enter eternity apart from God have chosen again and again throughout their lives to do so.
No one gets out of this life alive. God kills us all. But as the Giver and Sustainer of all life He is in a unique position also to be the Taker of all life. God never murders anyone; He simply does what He wishes with what He has made.
His only anchor on God came from believing that God was watching and cared.
Did God leave Job childless, destitute and diseased? No. But a God who didn't care, who was evil and cruel, would have left Job to stew permanently in his own unhappy juices.
Job understood that God can do with
His Creation anything that He pleases. We have no more right to anything from God, no more right to be treated by God in a particular way, than a clay pot made by a Potter has the right to tell the Potter how it will be treated. We exist by God's will and power and we continue to exist by His pleasure. We have no rights but what God chooses to give to us. And what God has given, He has every right to take away.
These are hard, even scary, truths. But God is not a "tame lion," who is obliged to put our needs and wants before His own, who can be called to account to us for His actions. He is not cruel or capricious but He is not under our thumb either, acting always in ways we understand or that please us.