(a) If a majority of the legal voters voting on the question at an election held under this Article, vote in favor of issuing bonds for community building purposes, the board of managers may thereafter issue bonds in an amount not to exceed that approved by the voters at the election. The bonds shall be signed and executed in the name of the township by the members of the board of managers or a majority of those members, shall mature not later than 20 years from the date of issuance, and shall bear interest at a rate not to exceed the maximum rate authorized by the Bond Authorization Act, as amended at the time of the making of the contract, payable annually or semi-annually as the board of managers determines. The bonds shall be sold at not less than par.
     (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.