I think you are confusing MCU and AP. There is MCU1 before March 2018 and MCU2 afterwards. There is AP2.0 through July 2017 and AP2.5 after that until March 2019.Correct. After 3/18, it was MCU 2.5.
Of course upgrades are available to MCU2 and HW3, so manufacturing date isn’t as important as knowing what upgrades have been done.