"It created this lack of work ethic in me that was fundamentally detrimental to the business and to our mission," Carson added. "It actually was a terrible thing."
In other words, all we know from the article is that this affected the CEO’s work ethic.
Edit: In fact, I think this is worth a flag for being both misleading and unsubstantive.
It seems reasonable that a schedule that suits the deep focus and creativity required for knowledge work is not as well adapted to the demands placed on a CEO.
"Carson explained to GrowthLab Live recently that the four-day workweek he had for his employees was ultimately nixed in 2016."
And I generally agree that a CEO in particular may struggle with this, which is why I give his personal statement the benefit of the doubt. Beyond that I would expect some sort of actual data to support any other claim about the business as a whole. This article implies a lot and delivers essentially nothing.