The title of the source graph is "Online Tablet Share Trending BY BRAND." The "brand" that achieved 45% market share online was Microsoft. The other two "brands" are Apple and Amazon. If your claim is that they say Microsoft to refer to all tablets that use their OS, then why is Amazon not included among all Android tablets and the brand listed as Google?
You know who else is saying that the SURFACE devices took 45% online market share? iPadBusiness says it. "
In October, Microsoft did something it’s never done before, it generated more revenue selling its Surface line of PC/tablet hybrids to online consumers than Apple made selling iPads, according to data from 1010data, according to iPadBusiness
That makes it nonetheless important as a milestone, since the release of the Surface Pro 3 did not cause this big of a ripple, and iPad managed to continue beating it handily every month....until this past October.