Aren't these two distinct things? The fact that one could be pro-diversity, while science says the way diversity training is being done so far is not effective, is not incompatible. It might mean that the way diversity training is being delivered and its content need to change, but not that pro-diversity "is wrong".

Imagine flight had not been invented yet. You wouldn't say that the Marquis de Bacqueville [1] attempt is the proof that flight is a bad idea or wrong. We continually improve and strive to find better ways to achieve goals we define as desirable. You might disagree with the latter, but this is a different point.

[1] https://en.wikipedia.org/wiki/Jean-Fran%C3%A7ois_Boyvin_de_B...