Your logic here doesn't follow, and thus you are the one who is "mistaken."
Secular historians who reported the Jewish Wars were not required to "take notice" of anything that may have been spoken by a Hebrew prophet.
This has nothing to do with any secular historians taking notice of any prophecy found in the Bible. Instead, it is ridiculous to argue that the secular historians would not have taken notice of these events:
"Behold, the day of the LORD cometh, and thy spoil shall be divided in the midst of thee. For I will gather all nations against Jerusalem to battle; and the city shall be taken, and the houses rifled, and the women ravished; and half of the city shall go forth into captivity, and the residue of the people shall not be cut off from the city. Then shall the LORD go forth, and fight against those nations, as when he fought in the day of battle. And his feet shall stand in that day upon the mount of Olives, which is before Jerusalem on the east" (Zech.14:1-4).
According to your ideas we are supposed to believe that an event where half of the residents of Jerusalem are taken captive is not even noticed by secular historians!
We are also supposed to believe that when the remaining residents are rescued by a supernatural force then the secular historians do not even notice or report about such an event!
Your judgment is not sound, friend!
Moreover, you are simply assuming that your interpretation of Zechariah 14 is what those secular historians were supposed to acknowledge.
The question I would ask about the fulfillment of Zechariah 14:1-4 is why we would not take it literally?
After all, the passage in Zechariah shows the feet of the Lord standing on the Mount of Olives and when He ascended into heaven from the same mount we read the following:
"And while they looked stedfastly toward heaven as he went up, behold, two men stood by them in white apparel; Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven" (Acts 1:10-11).
It is impossible to think that this passage is not saying that the Lord Jesus will return to the earth in the same manner which He left. And since He left with His feet standing on the Mount of Olives then it should surprise no one that when He returns His feet will likewise be standing on the Mount of Olives.
So why don't you tell me why we should not take the prophecy of Zechariah 14:1-4 literally?
Most Preterists I know would find your approach laughable.
What is laughable is your idea that an event in Jerusalem where half of the city is taken into captivity is not even noticed by the secular historians. And then the same secular historians do not even notice when a supernatural force intercedes to rescue the remaining residents!