Please clarify this matter in Bidayah wan Nihayah 11-172


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Bidayah wan Nihayah ibn Kathir
//The prejudiced ones claim that Ibn Kathir writes in his Al Bidaya wal Nihaya (11-172) that the Fatimide-Obaidite state, which descends from the Jew, Obaidillah Bin Maimoon Al Kaddah, ruler of Egypt from 357-567 A.H., innovated the celebration of a number of days, among them, the celebration of the Prophet's birthday. This treacherous lie is a grave insult to the scholarship of Ibn Kathir and the scholarship of all Islam.//

Please clarify this statement true or false because one of my friend told, there was no any sentence like above book in cheptor 11 page 172.