I suppose this is true, but also mostly irrelevant. If I am faced with two doors, behind one a car and the other a goat, I am technically making my own luck when I pick a door, but there's still nothing I can do to improve my chances of getting the car past 50%.
You are looking at the single point of choosing the door as your definition of luck, rather than all the decisions that led you to be in a position where your only choices were between a car and a goat.
When I say you mostly make your own luck, I was referring to making decisions and choices so that you don't end up with only a car or a goat as your choices.
