Their diversity quotas are presumably expressed relatively, not absolutely. In other words, they don't say "we need 10000 'diverse' engineers", they say "we wan

Their diversity quotas are presumably expressed relatively, not absolutely. In other words, they don't say "we need 10000 'diverse' engineers", they say "we want our engineering organization to be 60% 'diverse'" (I'm obviously making up numbers here). Ergo, the shortage in question isn't an absolute number of 'diverse' engineers, it's a shortage of proportions in the pipeline. And they can't do too much to stray from the proportion because they're constrained on one hand by hiring laws (there is only so much you can do to avoid hiring white/asian guys without overtly violating the law) and on the other hand by a fiscal need to hire more engineers at a sane price point. Note that 'diverse' is quoted here because the whole corporate diversity enterprise is utterly superficial or it wouldn't categorize individuals as 'diverse' or 'not diverse' and it wouldn't choose the most superficial criteria (race, gender, etc as opposed to viewpoint, perspective, or cultural diversity) to make those assessments.