Meh - "Growth Percentage" stories are basically worthless. And this one, like nearly all, doesn't provide any perspective on where the players were to begin with. So it's impossible to make any judgement (good or bad) on whether the change is significant or not. And there's also nothing regarding what type of usage - I would presume Laptops and 'client' computers to do regular office tasks. But the article says nothing about where anyone was to begin with, so it's impossible to quantify.
I'll pull some made up some numbers out of thin air to serve as an example of what I am talking about here:
If Intel gains another 1% of the market, and they have 60% to begin with. Then everyone snores. It's not news. And I'm pretty sure we can all agree the gain is insignificant.
Now - If Apple gains 1% market share, but they had only had 1% to begin with: Then yeah, they have '..explosive 100% growth...'... But in terms of the overall market share and units sold that gain is still totally insignificant.