If the community is public and shows up on All, then yes. I don't know if lemmy has private sublemmies but if they do, that might be the solution you are looking for.
this post was submitted on 28 Jan 2024
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It does not. Other then running a private/closed instance there's really no way to limit input from anyone with an account.
I downvote non-English results I see on my All page as a punishment for not correctly setting the language on the post, which takes 1 second to do and would ensure it doesn't spam the feed for non-speakers. I can't imagine I'm alone - was the post in question not correctly tagged as Polish content, like your post is correctly tagged as English content?
If it was correctly tagged, then those downvotes were all from people who speak Polish.