Did you read the article?
In point of fact, Apple's profits are NOT growing. That is the important take-away.
You read it wrong. It said that the growth in profits is flat, not the profits themselves. The derivative of the profits is 1 (constant growth).
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Sales are not flat. They are up 18% YOY. It is profits that are flat.
Profits are not flat. And why would sales be up but profits flat? That would suggest extra costs.
Here are the rough graphs that are theoretical and not to-scale (except for the last one):
Apple's total money earned vs time = integral of profits vs time:
Apple's profits vs time:
Apple's CHANGE in PROFITS vs time = derivative of profits vs time:
Notice how the last one is flat at 0. THAT'S what this article is talking about, and that's what the investors are all worried about. It was rising before. All this is based on integration of the profit change vs time and not data, so it's just theory.
But I just realized that the article may be incorrect or unclear. It stated a $40M increase in profits over a year... not sure if it's rounding down to 0 or what. But it said that it was a flat increase in growth (aka profit?). The profits used to go up more than constantly over time.