The history leans to the left is the core underpinning of communist parties everywhere, hence the coopting of the term progressive and progress.

The role of the communist party wherever it resides is to accelerate the historical forces to the proletariat utopia they believe lies at the end of history.

This is of course ridiculous, there is no end state of history, other than everyone died.

And of course the author confuses liberalism with the left as many in the Anglosphere do, mostly because they have lived in places where the "left" party is usually some sort of social democrats at their most extreme.