I think what that is saying is to keep track of whatever settings will be lost so you can go back and recreate the proper settings after the battery is reconnected.
I had a long-recurring issue with a parasitic current draw on my MY19. Battery was disconnected or discharged many times. The only thing I had to do, as far as I can recall, is the one touch window setting and some customized settings such as psi (not kPA) for TPMS, the loudness of some Eyesight settings, etc. Basically user preference settings. Took maybe 5 minutes to go back thru and reset them.