This appears to be true for a plurality, or maybe just barely a majority of people.

I don't find audio so easily multi-tasks, unless we're using different definitions. My example: I find it very difficult to do something described in an audio or video format - rewire a light switch, say. I find it way easier to have text with a diagram. I can stop and check the text at any time. I find it easier to go back to previous sentences, than to rewind an audio or video.