I'm also confused because some of those communities that are on other instances such as lemmy.world actually have activity even though they don't display anything in kbin. For instance the lemmy.world motorcycles community has activity but none of that is displayed when searching for motorcycles via kbin.
this post was submitted on 16 Jun 2023
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Not sure if this is the exact answer, but say you have a kbin user and a lemmy "magazine" or whatever they call them there. Once the kbin person joins the lemmy thing it automatically federated. However, it does not "back populate" the kbin. Kbin will only see new posts going forward after the federation.