SRS, the air fryer recipe for sweet potato fries still uses oil. It just takes away the huge oil hit of deep frying but I seem to have more consistent success with frying. I'm working on it.

I was trying to remember the other name that the orange sweet spuds are known as in Oz. I just scrolled to the bottom of the first page I linked to and it is there: kumara, with the explanation that that is the Maori (i.e. First Nations people of New Zealand) name for it. It is known by both names here.