Keep in mind that these statements are made to pander to the incoming president. The implication that "DEI is discrimination against white people" is very much a part of that.
> why the initiative in the first place?
Ultimately this is the same answer as with the broader ESG incentives. It is in fact a good idea to have a diverse workforce for the exact same reasons evolution keeps diversity around.
The pretense that it's "discrimination" is rather silly, especially for tech giants like Meta whose shortlists of qualified applicants number in the hundreds to thousands after initial selection.