Myth 1: the video tag will replace Flash video
The video tag won't replace Flash video? Has he missed the memo that YouTube, Vimeo, and DailyMotion have already rolled out HTML5 support? It is not perfect, but it is clearly going to happen. Whether this hurts Flash, is another story: but HTML 5 video is already here and has replaced Flash for many people.
I'd like to see a good analysis arguing why this trend might not continue -- not an apologist stick his head in the sand.
Myth 2: HTML5 is here, Flash is dead
Flash obviously is not dead. However, HTML 5 is here. See WebKit, Firefox, the iPOS platform (his invention), Google Chrome OS, etc.
Myth 3: Canvas is good for artists
He doesn't really expand on this point except to give a few minute examples of things he doesn't like about it. For example, you can't use fonts that didn't come with the browser. Pardon? Has he totally missed the web font module of HTML5?
Canvas doesn't provide interactivity and it is impossible to make a game with it? What? I have personally played Contra with an HTML 5 Canvas NES emulator. http://benfirshman.com/projects/jsnes/
Myth 4: HTML5 will solve all the problems associated with Flash
He goes on to argue that most of the problems with Flash (splash pages, high cpu usage, etc.) will continue with HTML 5. This is true, and his only good point, although I have never heard anyone actually say this...
However, HTML 5 will provide a much better, open sandbox for these problems. E.g. you can modify the DOM to block an ad, or detect a script that has gone into an infinite loop, etc. See Google Chrome or various ad block or Greasemonkey scripts for some creative uses of this fact.
With Flash, at best, you can simply kill the plugin.
Myth 5: Adobe is not scared of HTML 5. In fact, Adobe is pushing HTML 5 forward even harder than Apple?
I was about to write up an angry rebuttal to this, but seriously, it's not even worth responding to. After reading this last one, I kind of feel like I've just been trolled hard.