I don't know what the rules state, but I don't see why they can't advise others what to do after selling their own shares. Don't people often give advise on shares in companies when they hold none themselves? It happens every day.
As long as they present all the known facts and options they would be behaving professionally and honestly. Right? The directors only advise. The shareholders themselves are the ones who decide, guided by their own personal circumstances and investment direction.
Cheers,
Gatesy
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