The cook time is mostly adjusted for the thickness of your steak and not so much the cut of steak you are using. Thinner steaks will require less time and thicker steaks will require longer cook times. The timing is also adjusted for how you like your steak cooked. Rare to medium rare will require less time than medium-well to well done. The only time I would consider lowering the temperature from 400°F/200°C when air frying a frozen steak is if it is very thick and you want it cooked past medium. By very thick, I'm talking greater than 1.5". The reason I might decrease the temperature with thicker cuts is to prevent the outside from burning before the inside is cooked to your liking. So, if you have a 2" steak that is frozen and you want it cooked well done, I would decrease the air fryer temperature to around 350°F and cook to temperature.