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It's using Canvas, so yes it's HTML5. And even though it's using Javascript, I've always considered that to be the tool you use to communicate with the HTML API. The same goes for CSS to some extent, too.

Anyway, the average joe needs a buzzword to sum up all the new browser advancements. "HTML5" isn't that bad, at least it makes sense.

Unless you prefer 'Web 3.0'? :)

It's not just a buzzword. Many of the new features of HTML5 assumes scriptability, so it's perfectly reasonable to refer to HTML5 without mentioning JS.

This is using the Canvas tag which is new to html5

I think we need to accept that the 'HTML5' name will be mis-used to mean 'HTML5 + CSS3 + JS'. It certainly is easier that naming all 3 component technologies and IMO its acceptable as those browsers that support HTML5 typically support some degree of CSS3 as well (and of course JS).

Here's the relevant section of the HTML5 spec...

http://www.whatwg.org/specs/web-apps/current-work/multipage/...

At least he didn't say it was pure CSS3.