Of course if you're not using windows the equation changes immediately! Also I noted how much xaml was required for the WinMo7 Hello World. Seems like they've pretty much given it to you already in a template. Shame there's no real analysis of the long term costs of development including app-store deployment costs, acceptance rates, etc.
It is an insanely sloppy article but the point is a valid one. Microsoft has spent all kinds of money making Development on WP7 easy and that's after they spent all kinds of money making Silverlight easy. WP7 development is very easy.<p>But my counter point would be "So What?!?" Hello World in DOS is easier than writing it in OS X. But people don't develop for DOS because no one uses it anymore.<p>In the same way it isn't ease of use that's keeping people from developing for WP7.
Unfair comparison: Android steps include downloading Eclipse, Windows 7 steps do not include downloading Visual Studio. AFAIK, Visual Studio is not a standard install on Windows.
I submitted the link because I thought it was interesting what Microsoft employees push as being platform advantages. I fundamentally agree with the above comments about the nature of the article - but that's precisely what makes it worth reading.