Rarely have I read an article with such a perfect balance between a premise I agree with an examples I do not. But I think this illustrates something important: what constitutes a context switch is not universal. It depends on what parts of a task you need to think about.

In the kitchen, from long practice, I do not have to think about prep, technique, or washing up. There are no decisions I need to make for those tasks. They take very little attention. This frees me to spend my focus on the more abstract goals of what I want to cook, and for me it is not a context switch to wash a bowl while an onion is sauteeing. I can certainly cook while keeping the kitchen clean more efficiently than I could cook and then clean it. But when I was first cooking, it was a context switch to go from chopping an onion to chopping a carrot. Both tasks required my attention and focus.