Small powerlevel, but it's pertinent. I was gifted an air fryer for Christmas...and it's pretty fucking great. With that said, it's also super easy. I've made chicken wings, tequenos, and home fries (potatoes in rough-chopped pieces), and each could not have been simpler. My point is not to brag about how great I am, but to point out that if they've been fucking up "cooking" packaged frozen food, there's no hope for either of them. You literally set a temperature and time, and you can check on it at any point to shake it or flip things or whatever. The only way you burn things is if you set the time for too long and don't bother to check on it.
Of course, neither of them seems to prepare much veg, so there's not a lot of chopping and other things going on, so they probably do just walk away.