"Internet-enabled devices in mature markets" doesn't include mobile, and as far as I can tell doesn't pretend to. So this article is essentially arguing against a claim Adobe never makes. Seems like sort of a made up gripe to me.
For the vast majority of people looking at that claim the message is "Flash content reaches 99.0% of Internet viewers".
Sam
The vast majority of people looking at that claim probably wouldn't include mobile devices in Internet viewers anyway. What kind of Flash content producer would say "oh, it's Flash, so it has high penetration among mobile devices, good"? If you want to reach mobile devices, you target them. It's implicit that we're talking about desktops here.