While it is obvious that the fact that except for the commander, the crew was composed of a woman, a Canadian and an African-Caribbean-American, cannot have happened by chance, I think that for this kind of mission also achieving a diversity target is perfectly fine.

There is no doubt that the members of the crew were at least equally qualified with the possible members of a less diverse crew, even if their provenance must have influenced the final selection.

Perhaps instead of doubting that it was right to choose crew members belonging to historically disadvantaged minorities, like Canadians :-), one should wonder why only the crew members are diverse, but not their chief, which is a more stereotypical American, as chiefs are expected to be in USA.

A conspiracy theorist can argue both ways, either that choosing a diverse crew was done as a favor to those kinds of people, or on the contrary, that choosing a diverse crew was done as a disfavor to them, to show them who is really their boss.

So no matter what choice is done, people can criticize it for more or less imaginary reasons.