No, because there isn't even really a coherent academic understanding of what "Post-Modernism" even is, let alone an coherent idea of a "Post-Left" analysis.

To be frank, the Marxist way of understanding it is that Modernism is defined by the reorientation of life around the factory, while Post-Modernism is defined by the reorientation of life around the spectacle.

However, the vast mass of humanity currently is defined by Modernism, while the West is firmly entrenched in Post-Modernism. Which leads to a kind of conundrum. Post-Modernism can only exist because someone else is experiencing Modernism. Where-as Modernism can exist outside and independent of Feudalism, Post-Modernism cannot exist outside of and independent of Modernism, which means that really, "Post-Modernism" is simply an extension and systemic maturation of "Modernism". A false and non-existent ideological transition.

Ignoring the side tangent, "Post-leftism" ignores the fact that leftist theory anticipates failure and regression.

And that is the serious theory, otherwise it is just libertarianism but somehow worse.