It's hard to say if it would have helped. My rationale would be that the engineers commonly dogfood their own products and do ad-hoc testing so a black engineer

It's hard to say if it would have helped. My rationale would be that the engineers commonly dogfood their own products and do ad-hoc testing so a black engineer may have been able to catch the bug before it hits production. Taking the example to the logical extreme I doubt the bug would have hit production if the entire development team was dark-skinned.