Matthew 24:30
“At that time the sign of the Son of Man will appear in the sky, and all the nations of the earth will mourn. They will see the Son of Man coming on the clouds of the sky, with power and great glory.”
The Wars of The Jews, 6:5:3
Besides these, a few days after that feast, on the one and twentieth day of the month Artemisius,a certain prodigious and incredible phenomenon appeared: I suppose the account of it would seem to be a fable, were it not related by those that saw it, and were not the events that followed it of so considerable a nature as to deserve such signals; for,before sun-setting, chariots and troops of soldiers in their armor were seen running about among the clouds, and surrounding of cities. Moreover, at that feast which we call Pentecost, as the priests were going by night into the inner (court of the temple,) as their custom was, to perform their sacred ministrations, they said that,in the first place, they felt a quaking, and heard a great noise, and after that they heard a sound as of a great multitude, saying, “Let us remove hence.”
Yet, “all the nations of the earth” did not see that and mourn, so even if Josephus recorded it accurately, it cannot be a fulfillment of Matthew 24:30.