There is no central FOIA office. Each agency has is responsible for their own FOIA requests. IF you are referring to this news story [1] That was just the FOIA office at OPM.
Yeah, don't be so hard on Musk and Trump. They're destroying oversight agency by agency, not all at once. Starting with the agency in charge of HR oversight.
[1] https://www.commondreams.org/news/cnn-foia-office-of-personn...