It’s the same book created by the Gnostics that was rejected by the Ecumenical Councils over a millenia and a half ago.
According to the author, the writers described Judas as being evil. These writers, described as Christians, lived much closer in time to the actual life of Jesus than the council which rejected their writings. If the writers wrote this book a century after Jesus died, what are their other writings which were closer in time or contemporaneous to the actual life of Jesus? If they were right about the nature of Judas, what else were they right about?