Sec. 31. (a) Revenue bonds issued under this chapter or under IC 14-6-29 (before its repeal) do not constitute any of the following:
(1) A debt of the state or of a political subdivision of the state.
(2) A pledge of the faith and credit of the state or a political subdivision of the state.
(b) The bonds are payable solely from the revenues pledged for their payment as authorized in this chapter or IC 14-6-29 (before its repeal).