Sec. 3. Revocation. The Presidential Memorandum of September 16, 2016 (Providing an Order of Succession Within the Central Intelligence Agency), is hereby revoked.
Basically it means that te DCIA is an appointed position and there is no automatic succession of authority. he POTUS has to appoint an new one, subject to senate approval. This retains control of the agency by the executive rather than entrenched fellows...