> 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?

em-dashes help flow ideas better than other means. For whatever reason, it's easier to process in my brain a comment with an em-dash rather than trying to split the idea into separate succinct sentences.

You can do small succinct sentences, but style-wise it sucks for longer passages.