Earlier quoted context omitted.
Both sides is not a marketing trick. And comparing this with weather forecasts is a false equivalence.
I believe what parent is claiming is 'both sides' is a black & white gimmick that does not depict the spectrum between two polarized extremes.
It basically means there are two sides (at least) to everything, that can't just be disregarded. Exceptions prove the rule, of course.
On another point, Hotelling's law is a really poor example when it comes to debates or questions of politics, in my opinion.