The admins did not remove the comment, a community mod did. Mods can impose further restrictions on their communities on top of instance wide rules (within reason of course), including banning LLMs. Lemmy.ml at least does not have a blanket ban on LLMs, but generally it’s expected that, 1, you should not post LLMs excessively, we mainly want to host discussions by humans, 2, you should disclose it’s from an LLM and which one it’s from, and preferably add to what it says with your own comments or analysis. If it’s a mix of LLM and your own writing, say so at the start of the comment, but if the community directly disallows LLMs then you shouldn’t post it there at all.