The provisions of subdivision (c) of Section 65912.131 concerning health care expenditure are distinct and severable from the remaining provisions of this chapter. However, Article 4 (commencing with Section 65912.130) is a material and integral part of this chapter and is not severable. If any provision of Article 4 (commencing with Section 65912.130) or its application, exclusive of those included in subdivision (c) of Section 65912.131, is held invalid, this entire chapter shall be null and void.