Revising a narrative by studying neglected evidence

Is ReOrient revisionist by definition because it revises the traditional model?

In that literal sense, yes. The distinction is between revising a narrative to favor one side and conducting a proper study of neglected evidence.

The literal description of ReOrient as revisionist is accepted because it revises a traditional model. The distinction concerns the purpose and method of that revision. One approach changes a narrative principally to make a previously disfavored side look better. The approach credited to Frank begins with a subject that has not received a proper study and supplies that study.