If that was how Mott32 did it, then they probably missed a chitload of steps in between.
My understanding is that the baseline requirement being a very crispy exterior skin and the inside is at the very least, juicy and tender. If you lookup youtube videos some of them even showcase Cantonese banquet restaurant chefs in Taiwan demonstrating the techniques where the juice literally drips out of the chicken (after slicing).
The preparation however is more labor and time intensive and needs at least half a day (although the very serious diners would pre-order ahead of time so the kitchen can invest more time in getting it right, provided they have Sergio class chefs who know what they are doing and not take shortcuts). It starts with a poached chicken marinated with a mixture of sugar, salt, water, maybe garlic, ginger, five spice powder etc, then the skin is splashed with another liquid mixture of white vinegar, molasses, red vinegar, maybe shaoxing wine then the key part is hanging the chicken to air dry. Then chef takes the entire chicken over a wok of hot oil, and splashes the oil over the chicken with the wok spatula (for lack of better word) evenly to a certain degree. This step is exactly how the old school glutinous rice stuffed chicken should be…unlike the shortcut places that just deep fried salt/pepper batter.
Typically when an order is placed, the final step would be to flash / deep fry the entire chicken. If done right, really crispy aromatic exterior, juicy interior and maybe you will get some redness/pinkness around the connector joints and slightly undercooked meat adhering to the bones.
Now if Sergio were a true Dark Lord of the Sith and a geek, he might prick holes in the right places of the chicken (one key place would be the eyeballs so to release as much moisture as possible that will cause a lot of problems during the deep frying and oil splashing processes if not handled correctly), including the back area of the chicken to allow cooking to be more even…but this could be more of a personalized technique.
This is why when a lot of restaurants offer this dish on the fly, you can imagine what they have to do to try to minimize all that hard work just to get it to the table.
I barely remember the last time I had a properly done classic crispy chicken… prawn and/or lobster chips deep fried were the decorations (not Peking duck style steamed buns), maybe some salt and pepper for dipping.