I don’t think that’s true, at least not given the classical definition found here on Wikipedia. In general, I think John Locke embodies liberalism really well, and he believed in a natural right to life, liberty, and property. So to me, property has been a foundational part of liberalism since its creation.
Then again, a lot of people use “liberal” to essentially be the same as “leftist,” meaning anyone left of center. But I think that’s silly, because in my eyes and using the academic definition of liberalism, both the Democratic Party and Republican Party have strong liberal roots, and they’re different in where they deviate from that (Democrats are weak on property rights and free markets, Republicans are weak on civil liberties and secularism).
If you’re anti-capitalist, by definition you’re not a liberal IMO. And I think most people who claim to be anti-capitalist aren’t actually anti-capitalist (can’t speak for you though), they’re just frustrated at our corrupted form of capitalism. A purer form of capitalism (less protectionism, i.e. fewer IP protections, fewer options to limit liability, etc) accompanied with a healthy safety net (e.g. something like UBI) and worker protections is probably more than adequate to most who espouse anti-capitalist sentiment.