Based on the context I would assume he means someone that has a deep understanding of which parts of the system can be powered down during certain events, can f

Based on the context I would assume he means someone that has a deep understanding of which parts of the system can be powered down during certain events, can figure out what the system bandwidth requirements are going to be and how to balance that within the power constraints of the device. I have worked on SoCs (System on Chips) for a decade and a half and there is always at least one person who's soul responsibility it is to make sure all the parts of the system gel.