Again, man has the natural ability but not necessarily the moral ability. No it don't. We do not require anything of man.
Nope. His claim has nothing to do with whether they are able. Ought does not equal able.
First problem is your theology claims man has no moral ability.
Second problem God says they may do it
Deuteronomy 30:11–20 (LEB) — 11 “For this commandment that I am commanding you today is not too wonderful for you, and it is not too far from you. 12 It is not in the heavens so that you might say, ‘Who will go up for us to the heavens and get it for us and cause us to hear it, so that we may do it?’ 13 And it is not beyond the sea, so that you might say, ‘Who will cross for us to the other side of the sea and take it for us and cause us to hear it, so that we may do it?’ 14
But the word is very near you, even in your mouth and in your heart, so that you may do it. 15 “See,
I am setting before you today life and prosperity and death and disaster; 16 what I am commanding you today is to love Yahweh your God by going in his ways and by keeping his commandments and his statutes and his regulations, and then you will live, and you will become numerous, and Yahweh your God will bless you in the land where you are going. 17 However, if your heart turns aside and you do not listen and you are lured away and you bow down to other gods and you serve them, 18 I declare to you today that you will certainly perish; you will not extend your time on the land that you are crossing the Jordan to go there to take possession of it. 19 I invoke as a witness against you today the heaven and the earth: life and death I have set before you, blessing and curse.
So choose life, so that you may live, you and your offspring, 20 by loving Yahweh your God by listening to his voice and by clinging to him, for he is your life and the length of your days in order for you to live on the land that Yahweh swore to your ancestors, to Abraham, to Isaac, and to Jacob, to give to them.”
Deuteronomy 30:11–19 (NASB95) — 11 “For this commandment which I command you today
is not too difficult for you, nor is it out of reach. 12 “It is not in heaven, that you should say, ‘Who will go up to heaven for us to get it for us and make us hear it, that we may observe it?’ 13 “Nor is it beyond the sea, that you should say, ‘Who will cross the sea for us to get it for us and make us hear it, that we may observe it?’ 14 “
But the word is very near you, in your mouth and in your heart, that you may observe it. 15 “See, I have set before you today life and prosperity, and death and adversity; 16 in that I command you today to love the LORD your God, to walk in His ways and to keep His commandments and His statutes and His judgments, that you may live and multiply, and that the LORD your God may bless you in the land where you are entering to possess it. 17 “But if your heart turns away and you will not obey, but are drawn away and worship other gods and serve them, 18 I declare to you today that you shall surely perish. You will not prolong your days in the land where you are crossing the Jordan to enter and possess it. 19 “I call heaven and earth to witness against you today, that I have set before you life and death, the blessing and the curse.
So choose life in order that you may live, you and your descendants,
Well, contrary to your beliefs, God stated they may do it while your theology holds they may not do it as per your doctrine of total inability.
Thus, it is clearly not biblically consistent.