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My research does not depend on any dates in Josephus. To be honest I’m not even sure what you are referring to. Anyway, the proof for 4 BC death of Herod has to do with details in the narrative and comparing with available eclipse data. There is no way scribal error has anything to do with that.
In any case, the death of Herod is only one data point for the birth of Jesus Christ in 6 BC. I have at least 6 others that show 6 BC is the correct year.