I think it is a safe thing to say that all (as in all) theologians agree the Old Testament authors were premillennial in their understanding of Eschatology.
However, some theologians would deduce (wrongly) we need to be premillennial, as well.
Since the OT authors wrote their prophecies before Christ’s first Advent, they were premillennial.
But, when Christ came, the millennium began at His resurrection.
So, the NT authors have inherently become post-millennial but not necessarily PostMillennial.