In any suit, action or proceeding involving the validity or enforceability of any bonds of an authority or the security therefor, any such bond reciting in substance that it has been issued by the authority to aid in financing a housing project to provide dwelling accommodations for persons of low income shall be conclusively deemed to have been issued for a housing project of such character and such project shall be conclusively deemed to have been planned, located and constructed in accordance with the purposes and provisions of this chapter and Chapter 11.