Maybe He use some resistor or capacitor.
No he doesn't that will have no effect on the current taken. At best it does nothing at worst it can damage the strip.
To keep the consumption down do not set the colours to bright values. The full current is only taken when all LEDs are set to full white.
Each colour component takes 20mA ( 60 mA for all three ) per LED when they are set to a value of 255, if they are set to 128 that will be half the current. If set to 1 they will be 1/255 of the current.
So careful control of what you set affects the current. However beware programming errors where you accidentally set the LEDs to way over what your battery can supply, you have no protection over that.