I think a major problem with advice for a general audience is that different people need different advice. I agree with you that a path to mastery usually involves putting in a lot of effortful practice and then learning to operate without conscious effort, to let muscle memory and such take over. I think people fail at this in different ways, however. I'm sure a lot of people fall off of mastery because they mistake the feeling of effort for lack of an innate talent or the endeavor being futile, and a lot of people fail to achieve fluency because they're unable to let go of the effortful, conscious mode of thinking. Advice for either of those groups is probably going to be counterproductive for the other

That said, I do think this article frames its advice in a clickbaity way by handwaving cumulative effort while talking about instantaneous effort

Reminds me of this quote from Walter Murch, from In the Blink of an Eye I think:

"Most of us are searching-consciously or unconsciously- for a degree of internal balance and harmony between ourselves and the outside world, and if we happen to become aware-like Stravinsky- of a volcano within us, we will compensate by urging restraint. By that same token, someone who bore a glacier within them might urge passionate abandon. The danger is, as Bergman points out, that a glacial personality in need of passionate abandon may read Stravinsky and apply restraint instead."

Well said.