[flagged]
(CODEOWNERS is a red herring: GitHub clearly intends for this policy mechanism to be used, and so it should be sound. Policy mechanisms should always be sound, even if there's a better or more general alternative mechanism. If GitHub intends CODEOWNERS to be that mechanism, then they should remove this one and document its replacement.)
(As others have pointed out, this isn't even necessarily something that makes sense with CODEOWNERS -- the point of a dependency policy is to not trust human identities at all.)