Only the original instance where it got posted will have a complete reply set–and only if there are no suspensions involved.
that should not be true. if all the instances involved in a comment section are fully federated with each other, the comments are the same on all of those instances.
things get complicated when there is defederation involved… but the base case is “everyone can see the same set of comments no matter the instance.”
lemmit.online runs on it’s own instance. have you encountered other reddit archival bots?