While there is no way to run Flash on iOS devices, accelerometer works only with iOS.
I belive that's what Steve was talking about in his Thought on Flash where he concludes:
"Flash was created during the PC era – for PCs and mice. Flash is a successful business for Adobe, and we can understand why they want to push it beyond PCs. But the mobile era is about low power devices, touch interfaces and open web standards – all areas where Flash falls short."
Kudos to html5 and guys creating this experiment. It's awesome!
Power consumption in HTML5 is still higher than equivalent Flash, touch is a non-issue but standards is where HTML5 shines. I believe many times technologists focus too much on the platform rather than delivering a product. There's still a place for Flash and HTML5 is getting better (but is hindered by fragmented browser support).
The good thing is HTML5 performance will continue to improve across browsers. The bad news is that devs will still need to tediously test across every browser and mobile device.
Your comment about Flash ads makes me wonder what's going to happen when sites start delivering rich (and battery-hungry) ads with HTML5. Flash at least has a convenient bottleneck where you can disable it on a case by case basis and not lose functionality.
Would they have not made this statement if it were not for Apple?
Well, that's for one of two reasons. First, platforms are more technically interesting than products. A product just does one thing. A platform can do many things, and it's the adaptability and extensibility of a platform that makes it more interesting than a product.
Secondly, often technologists aren't so concerned about the individual product as they are the about the market for products. A platform with standardized interfaces and specifications will have a more robust market of products running on it than a platform with proprietary interfaces and specifications.
Flash's crashing 3 times for me this morning, across two computers, shows Adobe's commitment to excellence.
It actually took me a good minute to realize it made use of the accelerometer.
EDIT: oh, there is a warning, but it's only rendered if canvas is not implemented, and merely links to the not-quite-blank version which requires trusting their actionscript instead. It also blames the browser for the quality of their authoring.