| Unfortunately, that passage was either heavily doctored or outright forged by a later Christian author. No observant Jew, as Josephus was, would have referred to Jesus as the Christ. Furthermore, Origen, a later Christian author, said that Josephus did not believe Jesus was the Christ.
Scholars argue about whether this passage is partially or entirely forged, but almost no one believes it's fully genuine.
Excepth Josepuhus was not writing for the Jews, he was writing for the Romans and as such his writings would be informing Romans that Jesus of Nazareth was the Christ to Christians.
Furthermore, Origen, a later Christian author, said that Josephus did not believe Jesus was the Christ.
True, but dispositive of nothing vis a vis the Josephus quote.
Actually most Jewish and Christian scholars believe that the passage as a whole is authentic, although there may be some interpolations. For eaxmple, , "He was the Christ...". However, "For he was one who wrought surprising feats and was a teacher of such people as accept the truth gladly. He won over many Jews and many Greeks." is generally considered authentic. Even without the interpolations the passage corraborates important information about Jesus that he was the martyred leader of the church in Jerusalem and that he was a wise teacher who had established a wise and lasting following, despite the fact that he had been crucified under Pilate at the instigation of some of the Jewish leaders.