Yes repeated practice and improvement makes you a master at something. You have to work through a lot of quantity before you start producing quality. But I think you’re misunderstanding the point of the statement. It means:
“Having the best or perceived best of something rather than a lot of cheap or less valuable versions.”
As creative people who produce stuff, quality should always be the goal, because quality has more value. And if you produce more value, you get paid more. Quantity may be a required pathway in order to get good enough to produce quality, but quantity is not the end goal.
If quantity is the end goal, you’ll be stuck in mediocrity forever. You have to strive for quality in order to make the improvements necessary to start mastering something.
So while I appreciate many of the smaller points you’ve made, the larger premise of your article is completely wrong in my experience.