He’s a liar for pretending he wrote the book, but how do you use words he never wrote to prove something about his life? His mother could just as easily said, “No way am I ever living in that festering sore of a British colony. If you think I’m moving there you can choke, turn purple, and die.”
His name is on the book. Whether he originally wrote the words or not, matters not. If there was a problem with the content, he could have left his name off the book as its author.