@jeffjarvis Thank you for calling attention to linguistic issues. As a longtime bilingualism researcher, I was surprised to see code-switching mentioned in a political context, as it means switching languages syntactically in a conversation, which I often do between English and Japanese strategically.
The video you shared clarifies that people switching ethnic dialects, registers, or accents should not be called code-switching but rather some alternative like style switching. As she emphasizes, everyone does it. Here in Japan where identity forefronts a person's role more than what they identify with, someone like my wife can have a different voice with each individual or type of interlocutor, like a bicycle with 50+ gears.