Look mate, if you just said “I’m a democrat so I’m a liberal” I would’ve understood that. I’m not that nitpicky about it. But a self identifying “RADICAL LEFTIST” would absolutely never identify himself with the term “liberal”. Hell, radical leftists (and including the far left) use that term as an insult. Which of course raises some questions when you use it for yourself while also being “far left”. It makes it seem like you’re roleplaying the “radical leftist” role. Just my two cents, you do you.
Also, no, “liberal” hasn’t changed definitions, ever. It was always the same thing: an adherent to liberalism. If you’re far left you’re a commie or an anarchist or whatever. Communism/Anarchism has nothing to do with Liberalism. They’re on different parts of the political spectrum. If you’re from the US I’ll make this easy for you: both democrats and republicans count as liberals. They’re both adherent parties to liberalism.
That’s like claiming you’re a far right socialist lol