Notoriously some years ago Ken Olson revived this allegation. I have today found an article by Alice Whealy, who specialises in the historiography of the Testimonium Flavianum, reviewing Olson’s arguments and disagreeing fairly firmly. It appears in a collection of articles, and there is a preview on Google books. Does anyone have an electronic copy of the whole article?
Alice Whealey, Josephus, Eusebius of Caesarea, and the Testimonium Flavianum, in Josephus und das Neue Testament, Tübingen (2007), p.73 – 116, here.