Sweet potatoes: to cook or not to cook?
I would prefer cooking them first. Sun-dried sweet potatoes do exist in some parts of Asia as a snack. They are chewy chunks rather than crispy slices as shown in your link. There are also freeze-dried ones around these days. Anti-nutrition contents are not overwhelming in sweet potatoes to my knowledge. So, uncooked should be fine. I think you will get better texture and avoid browning by cooking them first.