I believe that setting blocks the poster's domain, and not the content of the post. You'd put "lemm.ee" or "lemmynsfw.com" in there, which doesn't seem to be what you're trying to do.
this post was submitted on 12 May 2024
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This is the answer right here.
If you want to filter youtube links, you need to add youtube.com and youtu.be you the keyword filter. But then every post containing a link will be hidden.