As long as you control your draft, your lineup, and your transactions that is a false statement.
I'm a financial planner in the real world, and I will compare it to managing a portfolio.
Sure what the markets do are out of my control (as are the games), however, I take alot of art and science factoring in many variables to achieve optimal returns within appropriate risk paramaters. The end results (which are generally constant) comes from my decisions more than anything else. Then it's mainly a matter of making sure clients don't make bad timing decisions----ala dumping Porter who has underperformed just before hitting TEN/KC on the schedule.
Luck is a minor part of the equation.
Last year was my first year, I won the league.
This year I'm in 2 leagues:
9-1 with a 3 game lead.
5-5 on a 3 game streak in a 14 teamer, where I lost my top 2 RBs and WRs to injury, I'm now a game out of 1st in a league of parity thus far.
You make your own luck.