"In studies 1 to 5, participants read various equality-enhancing policies that would provide additional resources (e.g., salary and jobs) to a disadvantaged group (e.g., Latino Americans, people with a disability, women, and ex-felons) without changing the resources provided to the advantaged ingroup (e.g., white Americans, people without a disability, men, and non-felons)."

That sounds a little too magical.

I understand policies might have that overall effect, at least in aggregate, but I doubt there would be widespread agreement on the "everybody wins" outcome.