This is a response to the "Flew Affair" by theistic philosopher John Haldane. I can't see how you can improve on his comments.
1) Debate on the existence of God has to proceed by argument, not by appeals to authority.
2) Accusations of wrongdoing have to be proved, and they have not been in this case.
3) Any ad hominem turn in the discussion of belief in God is a bad thing.
4) While charges of manipulation may be unjustified, Flew has suffered some reduction of "vigor" due to age and that he cannot be regarded as a major player in the philosophy of religion. It doesn't follow from this, however, that the book is fraudulent.
5) What Flew has "converted" to, it is agreed on all hands, is considerably less than traditional theism. On a "Christian exclusivist" view of soteriology, Flew is still headed for eternity in hell.
If people can read Flew's book as an account of an intellectual journey I would hope that there would be enough of Flew there to make it worth the price of purchase. But as cutting edge philosophy of religion, no, I don't expect that. There's no good reason to believe that Flew has deteriorated completely, or that changes in his mind can be entirely explained in terms of Alzhiemer's-type deterioration.