I don't think Meta was in any danger of anything, either implementing pro or anti DEI policies. Zuck is still owner founder. He does whatever he wants, see: metaverse fiasco. The average person could not care less about meta's DEI policy, unlike Meta's content moderation policy. Meta was not in danger of being regulated by congress, who can't seem to even fund the government properly, less agree on any kind of regulations on tech hiring. Who does this pander to exactly? Meta's reputation isn't exactly stellar to begin with among all sides.
This feels like an incorrect read on the situation. More likely this is just a blank check to hire as many people on visa as they want without having to conflict with any official policies. Meta already has entire orgs staffed by people of certain countries (hint: not US).