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@exador23

The visibility of the reply would depend on which visibility setting you choose for it. Public and Unlisted are visible to everyone, followers-only to followers, mentions-only to accounts mentioned in the reply.

If you remove all accounts from the reply, no one will be notified about it being posted, not even the person who started the thread (though they may be able to see it when browsing the thread, if you've chosen a visibility that they can see).