ribelo is saying that "modern liberalism" can be characterized by a belief that "There must be in-groups whom the law protects but does not bind, alongside out-groups whom the law binds but does not protect."

At least in leftist philosophical circles, which are what I am familiar with, this is a relatively common critique of liberalism.

Another common rhetorical tactic in leftist critiques is to point out that the bad beliefs liberals often blame the conservatives for having are actually in practice tenants of modern liberalism too. For example both conservatives and liberals are in favor to some degree of using the military overseas to maintain global hegemony.

I don't know if ribelo is leftist or not but in any case I can see what they are going for.