The title of the book clearly stated a part which said'A PERSONAL HISTORY OF BIAFRA' and the introduction section mentioned '..... the source of my own perspective'.
Come to think of it, He is the only writer who had published a book depicting what the war was like from an Igbo mans perspective. No other tribe tried writing to that effect from their own perspective. The notes at the end of the book also provides sources for further reading in case you think he's lying. I'm sure this writer didn't bother checking before concluding.
The truth of their generation in Igbo land is clearly stated in the book, he never tried to explain the way the Yorubas lived their lives cos he wasn't raised there.
If you have a problem with what he wrote, go and provide your own vivid evidence from a valid and reliable source and present them. Not saying just because of resentment that what he wrote is a lie