> Now she's been accused of using AI for her pieces.

Read the observation that AI was (presumably) trained on the 'best' (or at least 'quality') writing, and so if good writers tended to use em-dashes, it should not be surprising that AI generates text with it.

But, if one's personal style included using them, you should continue to do so because why should you dial down your own voice just because someone else may be mimicking it?