69.0.2. The rate of contribution that must be levied on the pensionable salary of the officer, who, if the officer participated in the Government and Public Employees Retirement Plan, would be a non-unionizable employee within the meaning of the Act respecting the Government and Public Employees Retirement Plan (chapter R-10), shall be reduced by a factor of 0.83 % applied to each of the rates established under subparagraphs 1 to 3 of the first paragraph of section 69 of this Act. However, the reduction shall not be considered for the purposes of sections 72 to 72.2, nor for the purposes of Division III.1 of this Act or for the purposes of the computation of the benefits payable under this plan.