@Cyracuz,
As far as old texts go, they're notorious unreliable. The putative passages in Flavius Josephus which are alleged to refer to Jesus are very likely interpolations. Louis Feldman of Yeshiva University, arguably the world's greatest living Hellenistic scholar and particularly with reference to Flavius Josephus, published a paper in the 1980s in which he states that more than 80% of modern scholars consider the Josephus passage to be at least in part, and some of saying in full, an interpolation. The famous passage in Tacitus which claims to mention Jesus (it doesn't actually do that) is considered by reputable scholars (those without a christian agenda) to be an interpolation.
As Joe points out, there is no confession. Even if there were, the provenance could reasonably be doubted--it could be a fabriction or an interpolation. As i said before, this guy's argument is flimsy.