You missed Web 2.0, around 2004, the rise of AJAX.
The post also states that Flash was "freedom", which it was only in a design sens.
The browser wars deserved a mention, probably in the Javascript section too, and the death of the "web safe" palette.
Embedded video everywhere is probably the biggest boon to designers in recent years, even if it's been theoretically achievable since Flash came onto the scene. Or earlier if you count animated gifs
Note also the omission of SVG support, WebGL, or any of a number of similar technologies that actually make the loss of Flash compelling.