That's the concluding paragraph before bibliography, this link. NIST is unclear to me, and no biblio links were pursued. Intellectual property rights and considerations might influence "stakeholder" opinions, as to universalizing some algorithm in some way, but NIST edits out boring detail in holding the page count down.
UPDATE: Isn't "crypto agility" what that server in the home was about - some manner of agility, agile truth, agile fiction, agile scrubbing in the instance, whatever other aims were in effect. Scrub first, answer questions later?