I cook my frozen steaks in the air fryer at 400 degrees for 6 minutes then flip them over and continue to cook for another 6 minutes. Then let them rest for a few minutes on aplate so the juices which come out will be absorbed by the steak again as it rests.
Also I do use my Therma Pen to check for medium rare, or if serving guests check for their doness temps too, from rare to well done.
The steaks are always perfect and delicious with plenty au jus included to add to mashed potatoes.!