Most of his argument comes from direct quotes of actual political philosophers like John Locke, John Stuart Mill and, Adam Smith. These aren’t just random scholars, these are people who are fundamental to the development of liberalism as a political ideology. Some guy on the internet who clearly has never engaged with that history of work isn’t going to change the actual meaning of the word either.
Look, I’m not citing a YouTube video because it’s the end all be all of sources. You should absolutely consider other perspectives. I’m citing it because it’s easy to understand and it’s clear you’re having a hard time understanding what people are talking about. I say again, you can still make up your own opinion but please inform yourself before you get into an argument of what liberalism is.
It doesn’t just mean “freedom”. I assure you if you have any conservative friends in “real life” they would disagree with the notion that liberalism just means freedom. There are probably even some Lincoln Project conservatives who would disagree with that.
I personally think that there are some aspects to liberalism that can lead society closer to being more free but there are other aspects to liberalism that work against that end. But almost everyone who has a basic understanding beyond a dictionary definition would agree that there’s more to it than just being a synonym for freedom.