I'm not sure about that. I agree that there isn't anything like a confession from Eusebius saying "it was me; I put in all that stuff", but it seems that the Testimonium Flavianum wasn't there when Origen got ahold of Antiquities... or at least not in a form that was exciting enough that Origen would think to mention it, which to me seems odd, since he wrote at length about the other reference to Jesus. Then, by the time Eusebius has it, it's somehow gained the Testimonium.
I think the most logical position is that somebody after Origen altered or added the Testimonium and Eusebius is on the short list of people who might have done it.
This certainly isn't conclusive evidence, but it is evidence.
You could make a case that the fact that the interpolations in the TF are so obvious lets Eusebuis off the hook;
1. The version he quotes is such a hackjob it's obviouslly a mutilated version of an earlier passage. If Eusubius (or any single author) were to create something whole cloth what would be the point of making it look like something that had been tampered with?
2. Whatever else he was Eusubis was an intelligent, highly educated man and a historian so no doubt he was familair with Josephus. For him to insert a claim that Josephus considered Jesus the Christ doesn't make any sense.
3. It's certain that Eusubius would have recognized the interpolations for what they were. The fact that he presents the TF with the interpolations intact, rather than taking it upon himself to edit them out or clean them up to make the overall passage seem more authentic, suggests (one possibility)that the passage as he presented it was fairly well known to his contemporaries.
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