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I closed your question, as it seems to be fundamentally asking the same think as the linked question. If you feel it is not a duplicate, you can edit to clarify, and it may be reopened.
Does "since he got out" imply that he hadn't been doing it before he got in? Alternatively, perhaps he was teaching beforehand, but only teaching the Dark Arts since getting out of Azkaban.
The question seems to be premised on "far far from Britain or any news about Britain". Is there evidence to support this premise (particularly the latter half)?