Response to Tonal range of Chromogenics compared to trad. B&W

This is a little off the subject, but I've been told that with XP-2 the image contrast can be shifted by exposing at different ISO. For example, if there is an extremely contrasty subject in bright sunlight, by exposing at ISO 200, it's "gamma" is shifted far enough down the H&D curve to be the equivalent of N-1 development. Conversely, exposure at ISO 800 will shift a flat subject up the curve to the equivalent of N+1 development. Any truth or partial truth to this?

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