You’re missing the part where they say that diversity is needed because the target audience is diverse. The goal of the Manhattan project was to deliver a worki

You’re missing the part where they say that diversity is needed because the target audience is diverse. The goal of the Manhattan project was to deliver a working nuclear weapon. Consequently its hiring practices were in line with this goal. Consequently your example of yoga instructors and psychologists (I’m sure there were psychologists consulting for the Manhattan project, however), is something of a strawman. What was being discussed was the idea that a company or organization that wants to appeal to the populace at large should have a workforce representative of that population at large. I think that’s debatable, but you can imagine that having someone on staff who can say “this is offensive (to my group of people)” can be useful to an organization. In this case, “I find this offensive” would not be a political or cultural message, but an actionable piece of data that says “For our goal of appealing to the populace at large, this statement/product may have lower, or negative, utility in appealing to this part of the population we’d like to like us/like to sell widgets to.”