Cooking is just applying heat to food. Stovetops, grills, and pans conduct that heat to food using metal; ovens conduct it using air; fryers use oil; sous vide uses water. Each provides increasingly precise temperature control. The dishwasher method uses both water and air and doesn’t have much precision of temperature control, but it turns out alright because food is pretty tolerant of imprecise temperatures in cooking.
I like to use the reverse sear method to cook my steak, and I have jokingly referred to it as pas sous vide (“not under vacuum”) because I’m imitating sous vide except using an oven to keep air at a certain temperature rather than using an immersion circulator to keep water at a certain temperature. But in principle you could say dishwasher salmon is pas sous vide as well.