It looks like he named it IRM_out, because it is the output of the infra red sensor, so an input on the PIC.
Not sure why he is setting it high, and I don't see it ever set to input.
Have you thought about emailing the author?
IRM_VDD VAR PORTA.0 'IR RX Module Out (VCC)
IRM_Out VAR PORTA.1 'IR RX Module VDD (OUT)
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