So, while I wholeheartedly agree that diversity inherently benefits teams and businesses (different experiences will lead to new and different approaches), it's just not a very convincing argument, because it feels "mushy". Here's one that I think is better:

If it's true that e.g. women have a harder time getting engineering jobs due to unconscious bias (and I'd posit that this is clearly the case), then that means female engineers are, as a group, undervalued. You should be able to hire a better female engineer for the same amount of money.

Harsh? Sure. But that's beside the point.

Cite this.

For the tech sector, in developed nations, this is nonsense.