Any amount otherwise payable under the plan to a rehired retired member for any month or part thereof on account of retirement or disability shall be reduced by the amount, if any, paid or payable to such retired member, including payments of any Worker’s Compensation benefits, for the same month or part thereof by the county on account of or by reason of employment of such member during such months by the county. Such offset shall occur regardless of whether such retired member is employed through a federally-funded program. No offset shall occur under this section in the event that the retired member is not employed by the county, such as, if the retired member is employed by an entity other than the county, or if the retired member serves in the capacity of an independent contractor.