Anti-capitalism isn't about "fixing" capitalism, or "changing" it, it's getting rid of it outright. It's about moving to a different system altogether. He might not be pro-this-flavour-of-capitalism, but he's certainly not advocating for anything actually different.
Everything he's saying is working within the bounds of capitalism. He doesn't want it to go away. It's not "a specific sin", it's that I fundamentally disagree with him because he thinks passing a couple laws will work, when there's actually no way to fix this within the confines of capitalism.
And he's not missing anything; as others have said, he's more interested in selling books and speeches (which getting people to use his specific terminology, and evangelizing on his behalf, drives) and profiting from this system.
If that isn't clear enough, then I really doubt I'm the one to best explain it. At least, not in the confines of toots on a social media site.