Does anyone know - if Mr Buchanan resigned his directorship does...

Does anyone know - if Mr Buchanan resigned his directorship does that mean he's no longer subject to the trading blackout, despite potentially being in possession of sensitive undisclosed company information received while serving on the Board?

I wonder how this conflict of interest would be managed in a practical sense considering as a non-director he's no longer required to announce shares that are sold (although the company itself would be required to inform market if his holdings fall below the 5% threshold)