The more the better -- should bode well for HTML-5 adoption.
I'm afraid that it won't have anything to do with it -- most of this web traffic from the iPad will be through apps (and not browsers) or through streaming media.
The article also claims that the iPad has surpassed Linux. Yeah, sure. With half of the entire Internet running on Linux servers and millions of Android-powered devices that have not been counted as Linux clients although Android is nothing but yet another Linux distribution (with a Java icing), I'm pretty sure that this claim must be right. (Warning: I was being cynical here.)
If one talks about Linux without meaning just the operating system kernel (that "Linux" technically only is), you can only mean the full range of Linux-powered platforms and distributions, and since Linux runs everywhere from a wristwatch over Google's and Amazon's data centers to satellites, I doubt that the iPad dwarfs the numbers of "Linux" on the web. You just don't see it that much on desktop PCs and notebooks.