Before, on, and after October 21, 1998, and notwithstanding any other provision of law, funds available to the Indian Health Service in this Act or any other Act for Indian self-determination or self-governance contract or grant support costs may be expended only for costs directly attributable to contracts, grants and compacts pursuant to the Indian Self-Determination Act [25 U.S.C. 5321 et seq.] and no funds appropriated by this or any other Act shall be available for any contract support costs or indirect costs associated with any contract, grant, cooperative agreement, self-governance compact, or funding agreement entered into between an Indian tribe or tribal organization and any entity other than the Indian Health Service.