(a) The board of directors may issue and sell revenue bonds payable from the revenue derived from the operation of the hospital for the purpose of (i) constructing, reconstructing, repairing, remodeling, extending, equipping, improving, and acquiring a site or sites for a hospital building or buildings or (ii) refunding any revenue bonds previously issued from time to time in relation to the operation of the hospital when deemed necessary or advantageous in the public interest. These bonds shall be authorized by a resolution without submission of the resolution to the electors of the township, shall mature at a time not to exceed 40 years from the date of issue and bear a rate of interest not to exceed the greater of (i) the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, or (ii) 9% per annum, payable annually or semi-annually as the board of directors may determine, and may be sold by the board of directors in the manner they deem best in the public interest. The bonds shall, however, be sold at a price so that the interest cost of the proceeds from the sale will not exceed the greater of (i) the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, or (ii) 9% per annum based on the average maturity of the bonds and computed according to standard tables of bond values.
     (b) With respect to instruments for the payment of money issued under this Section either before, on, or after June 6, 1989, it is and always has been the intention of the General Assembly (i) that the Omnibus Bond Acts are and always have been supplementary grants of power to issue instruments in accordance with the Omnibus Bond Acts, regardless of any provision of this Article that may appear to be or to have been more restrictive than those Acts, (ii) that the provisions of this Section are not a limitation on the supplementary authority granted by the Omnibus Bond Acts, and (iii) that instruments issued under this Section within the supplementary authority granted by the Omnibus Bond Acts are not invalid because of any provision of this Article that may appear to be or to have been more restrictive than those Acts.