Not really? Everyone who finds out we're studying dark magic is getting a paper with the Emperor's signature on it pushed in their face, which is the point of getting official permission. The thing is, even if they can't shut us down outright for the Dhar thing, they can still use it for fearmongering.
Your logic is baffling. People are going to accuse us of being untrustworthy because the Emperor has publicly given us permission to breach Article 7, a permission only given to the most trustworthy of wizards, but if we do it behind the backs of the institutions set up to oversee and manage wizards that makes us more trustworthy?