correct, the foot probe replaced the Z endstop, so nothing should be required to change that.

and no don't uncomment that line.

the only thing you should be concerned with in that is the #define servo0

the number after that defines the software servo pin. once that servo pin is defined and you uncomment the ABL stuff and the servo stuff in config.h and flash it you shoiuld start being able to manipulate your servo so that it will start moving and you can define your servo angles