Definitely too commie for them. But the question isn't whether lib theory exists, but whether they actually read it.

The vast majority of liberals get their ideas passively, from cultural hegemony. They don't read books on politics because they think they already have all the answers, that it's all simple and obvious. Just support "freedom" and oppose "authoritarianism," and there's no need to actually deconstruct and examine those concepts, because it's "obvious" what they mean.

It's like, hell, I've even read shit by Giovanni Gentile, who laid out the ideological foundations of fascism, in the hope of finding a coherent formation of that ideology for the sake of knowing the enemy. But I did so knowing that actual fascists would never read that nerd shit. What they actually engage with are conspiracy theories, rage bait, incoherent rants, shit like that. It's the same way, we can seek out liberal theory to try to grasp some insight of the latent assumptions liberals are operating under, but it's only so useful when they themselves don't read it, when they aren't even consciously aware of those assumptions.

If you try to ask them something that exposes a hole in their ideology, they'll just ignore it, refuse to answer, or change the subject. They never step back and actually think about what they believe. It's not something they're interested in. Instead, they're immersed in the soup of current events, just reacting to the current thing, and their opinions are formed around a combination of ideas absorbed from cultural hegemony, and what the news tells them to think about them.