All the communities on lemmy.lukeog.com are mirrors of Reddit boards. lemmy.lukeog.com does not accept posts from Lemmy users – only its bot may post and comment, and its posts and comments are just mirrors of Reddit posts and comments.
This doesn’t seem like a useful way to use Lemmy. It’s more like just a mirror of Reddit, in which case archive.is or web.archive.org would be more useful, in my opinion.
Better not to waste bandwidth and resources on this, in my opinion.
Lemmy is distributed across different instances. Instances can “federate” with each other, which means they share content and users with each other. “Defederating” means to remove that content sharing with the other instance.
As an example, let’s say that Instance-X contains unregulated hate speech on it. Other instances can remove federation from Instance-X so their community posts no longer get shared to/from them.
Thank you!