Resistor selection and filter
R1 is stated as being 0.3 ohms and it is in parallel with an inductor of 1uH (stated as having minimized DCR). At DC, the inductor will take (likely) over 90% of the required supply current because its series resistance will be a fraction of an ohm.

So what does it do - if high frequency noise or ripple comes along the impedance of the inductor will rise and you are left with R1 and C1 forming a low pass filter to prevent high frequency noise affecting the module.