Yes, the game market is often hard. But I find this author's attitude fatalistic and weird. (Also I agree that the numbers do not add up).
He seems to think that "rolling the dice" is the primary thing going on, and that he can't influence this substantially by any amount of development skill, proper tactics, and so forth.
I wonder if this kind of mindset is a side-effect of modern-day political correctness -- that if you succeed, it is 100% due to your good fortune (combined privilege and luck) and not because you did anything special to get there. The upside of such an attitude is that we recognize luck and recognize that people who failed did not necessarily fail through fault of their own. One major downside is that we feel a lack of agency, and this lack of agency is almost certain to drastically decrease the chances of future success.
Be careful what you believe, because it matters.
For my part, I think talent and skill and grit are huge factors in success, so if I want to succeed at something, I am able to formulate some kind of a plan. I don't feel that I am "just rolling the dice", even when luck is involved (which it is all the time, in everything).