The notion that "Not doing politics" is political position is a fairly recent fallacy. I believe that the individuals who parrot this sentiment verbatim have been reinforced with this idea from lobbyists and monied interests (including corporations and the media). The reason that I think this is as follows:

This notion helps to habituate partisan zealotry, which allows individuals to have their attention captured for profit, and makes them more manipulatable. If non-involvement in one facet of one dimension of life (politics for the benefit of corporations) is now not possible, then nobody is safe from the moral imperialism of political movements.

There are many spheres of life and influence within the world, and politics is but one of them. In modern times, however, the lines between different currencies of power are blurring, and there are clear channels for the transmutation of different types of power and capital to political power. For corporations, this is very appealing because democratic ideals, the environment, or individual rights might be at odds with their interests. Therefore, if they can convince you to give up your individualism in order to become politicized towards a cause that benefits the corporation, that is a wonderful way to circumvent democracy and concentrate power.