So I have stumbled upon a recipe on seriouseats about double frying chicken wings in this case to get it to the most crispy buffalo wings possible. It makes me think will it helps with getting “ayam goreng” chicken legs and breast, which is traditionally cooked without any coating or batter (just marinated beforehand) to be the most crispy and juicy possible. Seriouseats mentioned to “confit” it first for 225-250F for 20 minutes and then letting it cool before final frying it at 375-400F for about 10 minutes.
I believe you are referring to this article? https://www.seriouseats.com/2012/01/the-food-lab-how-to-make-best-buffalo-wings-fry-again-ultimate-crispy-deep-fried-buffalo-wings.html
Funny enough, I was reading this yesterday. And if you go through the end, Kenji gives a very scientific explanation on how double-frying your wings can make them more crispy.
Basically, frying first in a 250°F will melt the colagen in the skin, transforming into a gelatin and adding a ton of moisture and juiciness. Then, frying into a 400ºF oil will dehydrate the skin, making it crispy.
It does help, yes. The first frying acts to partially dehydrate the skin, while partially hydrolysing the collagen into gelatin. The second frying then completes the dehydration and "puffing up". If you didn't have the first frying, there would be less time for those effects before the food burned.