Linux is NOT an OS and Linus did not create the OS. The OS is GNU the kernel is Linux. Thus you are comparing numbers for a kernel (Linux in Android OS versions) vs. numbers of OS's (Windows, OSX, iOS). This isn't a technicality either. Get it straight because as the article stands, it's unresearched garbage.
I've heard the argument that Linux is not actually an OS several times; but I must admit I don't completely understand it. Why is it so inappropriate to conflate the operating system with the kernel? Perhaps this is just the operating systems course I took in college talking, but I recall that an operating system is defined not by the programs in user space, but rather by how everything is handled behind the scenes;…
Perhaps some people consider the kernel to be the OS and the userland to be whatever else. I am much more bent towards the thought of an actual distribution being the OS, and the underlying kernel being just one part of the OS as a whole.