I don't think Chimbu's post displayed any elements of "lucky bravado".
The blanket “don’t turn back” is a good one to teach in my view, because it is very dangerous, and if you haven’t trained for it you’ll be putting yourself in a very poor situation. However, in the situation Chimbu described a logical series of steps were followed beginning with high altitude trials and progressing to a realistic situation.
This seems to me to give them the knowledge of under what weather conditions, at what height, and in what manner a turn back can be accomplished in their aircraft.