Contracts entered into or amended by the State Public Defender to implement Sections 15420 and 15421 shall be exempt from Chapter 6 (commencing with Section 14825) of Part 5.5, Chapter 6.5 (commencing with Section 14835) of Part 5.5, Article 6 (commencing with Section 999) of Chapter 6 of Division 4 of the Military and Veterans Code, and Part 2 (commencing with Section 10100) of Division 2 of the Public Contract Code, and shall be exempt from the review or approval of any division of the Department of General Services.