i am not sure yet, but i think that way will not mess anything since only sets time in certain FW versions. I think this is the way to bypass the problem when the cmos battery did end its life. Of course a modded console is required to bypass this.you may be able to fix it with todex, but the rtc payload only works on 5.05. it messes things up on later firmwares.
Anyways it will be interesting to know what you have find on this...