I mean you signed up on lemmy.marxism-leninism. Yeah they tend to lean left, lol.
But yeah your observation indeed is is correct. Not only does lemmy lean left it often leans pretty far left too. It might feel like a breathe of fresh air but it's still a bubble and echo chamber. It's the same as truth social but the exact opposite. Nothing wrong with that per-se but it's a good thing to keep in mind. Factual information is regularly downvoted here not because it's false but because it doesn't fit the narrative.