Technically, but the algorithm consists of which communities you’re viewing and what order you sort posts. Generally when people talk about an “algorithm” in social media, they mean an opaque self-tuning selection process based on your usage patterns (and whoever is paying them the most). And Lemmy doesn’t have any of that.

If you’re selecting sort-by-new and you’re noticing problems with getting old posts mixed in, that would be a problem. But seeing the same posts when you’re viewing the same communities and sorting the same way isn’t a problem, it’s showing you what you asked for. Why blame the “algorithm”?