Saying liberals aren’t left wing is gatekeeping the term. Imagine saying that I’m not left leaning enough. Wtf is that supposed mean!
Liberalism is the political ideology of mainstream capitalism, particularly for the imperialist countries. As the global economic system for decades and decades, this makes liberals a conservative ideology, its members attempt to maintain the fundamental capitalist status quo. Its members that attempt to make substantial changes begin to push at the fringes of liberalism and end up working against it. Reactionaries try to “restore” a largely fictitious past glory and reinforce conservative social mores in order to scapegoat the problems of liberalism onto marginalized communities. Those on the anticapitalist left, those that actually oppose the system itself, are the actually progressive historical actors nowadays. You could have given liberals that label in the 1700s to mid 1800s perhaps, but they are not the defenders of the current order.
Leftism is to go against the current class order, Liberalism supports it. Leftism isn’t an arbitrary vibe, if you’re pro-Capitalism then you aren’t against Capitalism!
Leftism isn’t to go against capitalism though. Leftism broadly refers to the ideology that supports socioeconomic equality. If I’m to remind you of the origin of the terms “left” and “right” as it relates to politics, the terms right and left refer to political affiliations originating early in the French Revolutionary era. “The Left” implied support for republicanism - becoming a republic, and not American republicanism, secularism and civil liberties.
Political scientists and other analysts usually regard the left as including anarchists, communists, socialists, democratic socialists, social democrats, left-libertarians, progressives, and social liberals. Movements for racial equality, as well as trade unionism, have also been associated with the left. Source
The sort of leftism you Marxist-Leninists advocate for is radical leftism. Social liberalism is still leftist.
Leftism broadly refers to the ideology that supports socioeconomic equality
Then by your own definition Liberalism is right wing! This is ridiculous.