That explanation effectively blows aways the Free Will Defence.
Original Sin is a curse upon all humanity, an act of extreme vengeance to be passed down and inflicted upon all subsequent generations. God cursed the serpent (talking snake): 'upon your belly you shall go, and dust you shall eat all the days of your life'; and he punished Adam (and men) with a life of toil: 'In the sweat of your face you shall eat bread till you return to the ground', and Eve (and women) he punished with painful childbirth and subordination to men: 'your desire shall be for your husband, and he shall rule over you'.
Now, I see no 'permissive will' in any of those statements, rather I see an angry God establishing his authority and making an executive decision that concerns every person who will walk the earth.
None of what you say applies to the Free Will defense. The Free Will defense argues that Adam and Eve were free to fall or free not to fall. They had an authentic choice. As for the free will of their descendents, only a fool thinks that all our decisions are free. And it may just be that our free will is constrained by a nature we have inherited according to which we are bound to sin. So we are free not to sin in the sense that on each occasion, we have an authentic choice; but given our fallen state, we are bound to sin sooner or later. Usually sooner.
As for the angry God establishing authority, you are wrong on both counts. Certainly God was angry with the sin, but anger does not characterize God. Love does. Thus Adam and Eve did not die immediately, and given the consequences of sin, death is a mitigator (imagine having immortality in a world of sorrows). He promised to redeem the world through the seed of the woman, which is a way of allowing humanity to play a crucial role in their own salvation. Indeed, the only one in the story who has no hope is the serpent.
Notice also that Adam and Eve retreated from God and sewed fig leaves together for coverings when their loss of innocence permitted them to 'realize" they were naked. They felt shame. But fig leaves are an inadequate covering, so God provided an adequate covering for them.
Leading up to the scene of judgment, notice that God tenderly calls out to Adam, "Where are you?" God knew where he was, of course, but he was inviting Adam to return to him. If he had, instead of blaming God, "It was this woman YOU GAVE ME," he would have been restored.
It's a selective reading that results in your conclusion, not the text itself, my friend.