The author really does not make that argument, they make the argument that your location does not affect your work, not that all people should get equal pay for

The author really does not make that argument, they make the argument that your location does not affect your work, not that all people should get equal pay for equal work. But this ignores the fact that the labour market in the whole of the US is not the same as the labour market in SV - so it is a pretty poor argument.