incorrect, the belief that the olivet discourse is completely fulfilled is not exclusive to full preterism. Some partial preterists, including myself, don’t believe Jesus was talking about his final coming at the end of the world, but simply his coming in judgement upon Israel, as that did in fact occur within the first century generation.
see the following examples of non full preterists arguing for the past complete fulfillment of the olivet discourse:
Gills exposition on Matthew 24:34 (Gill was a historic premil).
“Verily I say unto you, this generation shall not pass,.... Not the generation of men in general; as if the sense was, that mankind should not cease, until the accomplishment of these things; nor the generation, or people of the Jews, who should continue to be a people, until all were fulfilled; nor the generation of Christians; as if the meaning was, that there should be always a set of Christians, or believers in Christ in the world, until all these events came to pass; but it respects that present age, or generation of men then living in it; and the sense is, that all the men of that age should not die, but some should live
till all these things were fulfilled; see
Matthew 16:28 as many did, and as there is reason to believe they might, and must, since all these things had their accomplishment, in and about forty years after this: and certain it is, that John, one of the disciples of Christ, outlived the time by many years; and, as Dr. Lightfoot observes, many of the Jewish doctors now living, when Christ spoke these words, lived until the city was destroyed; as Rabban Simeon, who perished with it, R. Jochanan ben Zaccai, who outlived it, R. Zadoch, R. Ishmael, and others:
this is a full and clear proof, that not anything that is said before, relates to the second coming of Christ, the day of judgment, and end of the world; but that all belong to the coming of the son of man, in the destruction of Jerusalem, and to the end of the Jewish state.”
Benson commentary on Matthew 24:34
“This generation shall not pass till all these things be fulfilled, — Hereby evidently showing that he had been speaking all this while only of the calamities coming on the Jews, and the destruction of Jerusalem. “It is to me a wonder,” says Bishop Newton, “
how any man can refer part of the foregoing discourse to the destruction of Jerusalem, and part to the end of the world, or any other distant event, when it is said so positively here in the conclusion, All these things shall be fulfilled in this generation.”