It is not the job of DEI in the United States to address worldwide historical systemic discrimination of inequality. Globally, DEI would be concerned with this, but not specifically in the USA.
The purpose of it within the USA is to address historical systemic discrimination within the USA, which certainly go beyond merely African slaves and their descendants but do not extend to discriminatory patterns in SE Asia.
That simplifies the objectives of DEI, but it makes for scenarios that are profoundly unjust. One of my college class mates grew up in rural Vietnam, and didn't have electricity until middle school. That classmate is categorized as "Negatively Diverse" according to the company's DEI policy. Even more undesirable than whites. I, on the other hand, had a dad that went to an ivy league university and accrued an eight figure estate before his passing. My sister and I had college and private school paid for. Yet we're categorized as "diverse" taking priority over the vast majority of candidates, most of them vastly less privileged than us.
What I said above then applies.
The logical conclusion is the approach taken for native Americans, providing each tribe payments at certain ages, special programs, and scholarships.
The outcomes haven’t been great, but not due to lack of opportunity. It’s as much money and DEI programs can fix. Fixing lives requires solutions that don’t scale.