1. You can wonder anything you want. It's when you start to act or form beliefs on the basis of that rank speculation that things get dicey.
2. It actually doesn't matter if the person is there because of race-based initiatives. The whole point of those programs is to correct for bias in the standard credentialing. At my son's HS, kids took 8, 9, 10 AP courses. My son took 7 AP exams (5 on all of them!). The rural HS my wife attended had zero AP classes when she was there, and now it has two.
So if you use the standard credentialing process, in which 7 AP courses > 1 or 2 AP courses, the kid at my wife's old HS would never have a chance. The DEI programs that help rural white kids in addition to minorities are correcting for that bias.
What you want to know about a black MIT student is the same thing you want to know about anyone: are they successful in school, and after.
3. I am virtually certain that DEI was how JD Vance got into Yale Law School. I don't begrudge him that, but it is really bad taste for him to be railing against them now. Sorta like Clarence Thomas.