this post was submitted on 24 Jul 2023
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The purging is in reference to removing the local copies on *their *instance. Federation creates a local copy of content visited by users as a cache that is directly interated with, and then any local comments, etc. are sent out after that.
This is why posts and comments will stick around and can be interacted with still after instances defederate. Updates after defederation simply don't make it back to the original instance because that connection no longer exists, but the local cahced copy does.