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this post was submitted on 17 Sep 2023
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Lemmy
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What happens if the posts were from an instance that was later defederated from the current instance?
Or was running an old (and now incomparable) version of the software?
If two instances defederate, then the servers aren't "talking" to each other anymore, meaning anything after defederation doesn't get synced. So yeah, if you had an account, then your instance defederated, and then you deleted the account, your posts from before could still be theorhetically readable on the defederated instance. Admins can easily purge accounts from the database, so it wouldn't hurt to reach out if you said something regretfull that was still visible.
I don't think the second scenario is capable of happening (yet) since ActivityPub is backwards compatible.