The specific way you phrased that question makes me suspect you misinterpreted this as a banning of speech. Not at all. They're removing a class of required question from application forms. “The MIT administration has advised the departments that were requiring DEI statements to stop requiring them and to stop using this kind of information. This has just recently been disclosed to the faculty, but a general announcement to the students is not planned.”
Unless I'm misunderstanding your question, the very start of the article seems to cover it:
>DEI statements are affirmations made when you’re applying for college admission, university jobs, or even science-society grants, recounting to the authorities your philosophy of “diversity, equity, and inclusion,” your history of DEI activities, and how you will implement DEI initiatives if you get the admission/job/grant.
Futhermore, the counterexample cited, teaching adult literacy, seems like a good way of furthering equity and inclusion to me. This sounded like the author contradicting themselves.