Not flipping. I added this step so you can place the pork in a different position so avoid uneven heating (the side that faces inside of the air fryer would face outside, after the rotating), because some spots of the air fryer might run hotter. If you skip this step, it won’t cause a huge issue.

You can definitely make this in an oven. I have an older oven recipe: https://omnivorescookbook.com/siu-yuk/
In that recipe, I roasted at a slightly higher temperature at the beginning. But I think you can roast at 300F for the first 2 1/2 hours. Then roast at higher heat 375F for the last 30 to 40 minutes.
Make sure to use foil to wrap up the pork really tight (my old recipe didn’t include this step). The foil will hold the pork fat and the pork will be protected from overcooking, thus generating a better texture.