It's not a "high bar." It's fundamentally different. The Sierra Club is a quintessentially liberal organization, not even nominally left wing in any way.

The DSA, however, might be a better candidate for a relative comparison, but it is still effectively just a liberal organization, despite it insisting otherwise. No historically left wing agenda would take any side in the shortsighted NIMBY/YIMBY dichotomy, both of which presume capitalism marks the end of history, which is definitionally a right wing position insofar as it effectively reinforces the established order (capitalism). A left wing agenda under a capitalist society must pursue progress while also undermining profit. The NIMBY/YIMBY dichotomy simply offers no capacity for that, meaning it is right wing by default.

These are of course contextual political categories but, by virtue of the enlightenment that produced them and the inherent forward direction of history, they can only become more complicated over time rather than more simplified. The definitions you're insisting on are strictly deteriorations of meanings and distinctions; they add nothing whatsoever to the discourse. With all due respect, their contribution is mere idiocy. It's the propaganda of American exceptionalism, a well documented anti-history that thankfully hasn't penetrated in every part of the world. I hope we can keep it that way for a bit longer.