Most gaming aesthetics involve a well defined attention to detail and high resolution (connoting the ongoing technological development of the industry). Furthermore, rich contrasting colours, generally speaking, serve to enhance the gaming experience. Or so the ads say. In any case, this publication does not speak strictly to the gaming community but those outside who are not particularly aware of the gaming community.
A muted colour pallet based on colours (orange, teal, red, etc.) found in gaming aesthetics servers to present a toned down design more befitting the audience. In general, designing for the whole (as the instructor puts it) rather than from the industry.