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@tokyo_0 This setting only applies to new top level posts that a person does -- all replies may be indexable regardless, depending on who you're replying too (and the UI does not show you where this is the case).

Also, the way robots.txt & robots meta tags are implemented here explicitly allows public, full-text search for all public content. Search engines follow those rules, and if there's something deemed useful, they will try to index it if it's annotated as being public.