A specific product form or product line of a domestic company that is licensed and doing business only in Kentucky shall be exempt from the requirements of KRS 304.6-143 if:
(1) The commissioner has in his or her discretion issued an exemption in writing to the company and has not subsequently revoked the exemption in writing; and (2) Either of the following are satisfied:
(a) The company computes reserves using assumptions and methods used prior to the operative date of the valuation manual; or (b) The exemption is consistent with the valuation manual.