If deliberate, it is anti-competitive and may well be illegal. Oh, and Google, even if not illegal, it is yet another example of how your jiggering of search results (paid ads at top) is a betrayal of public trust.
Since people run versions of windows on their Macs, one could say their are more versions of Windows than devices as well.In the end, that proves little one way or the other. There are still X devices sold and Y units of software sold.
Reread the article. It deals with code for the 4s as of 11/12/2011. That would be iOS 5. The current iOS version is 6. The article says "current" code. One would assume they asked for iOS 6. Version 5 should be sufficient to assert the claim if it supports the claim.
I use it a fair amount. It's great in the car when you need simple answers that don't need to be read. (If you turn on certain other features, then Siri's more complicated responses will be read back to you.)But, I find it most useful for making quick notes, setting alarms, setting caledar events and reminders, and dictating.