Can you prove that to be true? The fact is, that is not what the wiki link stated. It also isn't what scholars have been saying for the last 20 years or even more.
As I have noted, my personal research occurred long ago. So I have been re-researching the subject. Understandably, some people do not take Wiki seriously despite the citations. So, here are some quotes from books and author's I have been trying to recall that I have found on the net...
"Now, it is a curious fact that older generations of scholars had no trouble dismissing this entire passage as a Christian construction. Charles Guignebert, for example, in his Jesus (1956, p.17), calls it 'a pure Christian forgery.' Before him, Lardner, Harnack and Schurer, along with others, declared it entirely spurious. Today, most serious scholars have decided the passage is a mix: original parts rubbing shoulders with later Christian additions." Earl Doherty,
Jesus Unbound.
"...the vast majority of scholars since the early 1800's have said that this quotation is not by Josephus, but rather is a later Christian insertion in his works. In other words, it is a forgery, rejected by scholars." Dr. Gordon Stein
"Mattathias, the father of Josephus, must have been a witness to the miracles which are said to have been performed by Jesus, and Josephus was born within two years after the crucifixion, yet in all the works he says nothing whatever about the life or death of Jesus Christ; as for the interpolated passage it is now universally acknowledged to be a forgery. The arguments of the 'Christian Ajax,' even Lardner himself, against it are these: 'It was never quoted by any of our Christian ancestors before Eusebius. It disturbs the narrative. The language is quite Christian. It is not quoted by Chrysostom, though he often refers to Josephus, and could not have omitted quoting it had it been then in the text. It is not quoted by Photius [9th century], though he has three articles concerning Josephus; and this author expressly states that this historian has not taken the least notice of Christ. Neither Justin Martyr, in his dialogue with Trypho the Jew; nor Clemens Alexandrinus, who made so many extracts from ancient authors; nor Origen against Celsus, have ever mentioned this testimony. But, on the contrary, in chap. 25th of the first book of that work, Origen openly affirms that Josephus, who had mentioned John the Baptist, did not acknowledge Christ. That this passage is a false fabrication is admitted by Ittigius, Blondel, Le Clerc, Vandale, Bishop Warburton, and Tanaquil Faber.'" Dr. Lardner as quoted in
Christian Mythology Unveiled.
The above I believe to be one of the most damning testimonials. The mere fact that people contemporary to Josephus, or for centuries after, who knew intimately his works, make to mention of the passage in question.
Also quite damning, IMHO, is the simply fact that, despite the plethora of historians and scholars of the day, that the
only non-biblical/non-Christian source is even questioned at all.
If even half of the "miracles" listed in the bible had occurred, they would be spread all over the known world before the man was said to have been crucified. Historians who lived at the time ascribed to Jesus make note of persons far and wide, from Celtic warrior queens to the exploits of Viking Norse. I find it utterly unfathomable that no legitimate mentions are made of said Christ figure in any historians writings, Roman records, nothing.