overton window is not a real thing, and is a fundamentally idealist framing of the world and politics

there is a liberal understanding of the world and history, and the marxist one. There is very little overlap. You can't "drag a liberal left" slowly like a gradient until they are a communist, at a certain point they must make a qualitative leap into a fundamentally different ideology. There is a point of confusion and radicalization where the radicalizing Liberal has "radliberal" confused beliefs, but this is not a real or legitimate position that has any coherency. It's just a moment of confusion as their old understanding breaks down and they have to build up the new one. There is no Liberal-Marxist synthesis ideology that has any coherency whatsoever, they're all philosophical abominations.

Claiming that people like Hasan are "pipelines to the left" fundamentally misunderstands how radicalization works. There is no straight line from Liberal to Marxist, you have to shift to another model entirely not move along an axis within a single unified "political compass" or "political gradient". Hasan can only take people as far left as he is, which is radliberal. He can only bring them into the confusion that he is mired in himself. He's stuck in that in-between incoherent stage, which is why he often gets "gotcha'd" in arguments or comes to the right conclusions for the wrong reasons (or the wrong conclusions entirely, like that we should support Ukraine). It's also why a lot of people on the left don't like him, he continues to make a lot of radliberal arguments and incoherent points.