First, there is no difference in the context of journalistic ethics. If you promise someone anonymity then you keep that promise. They don't do what is being alleged.

Second: you don't actually know that. All we have is what Scott tells us he understood the reporter to have represented as the subject of the story. Reporters don't break promises of anonymity, but they routinely lie to sources if they think it will get them to disclose facts worth reporting.

All I'm saying here is that if this is escalating to a "shut it all down" level, there's pretty clearly more afoot here than a mere unmasking.