probably. and I sure hope so, since they use it as an example.

but why in the world would you have that happen on a font demo site? use an image/svg. otherwise it's risking becoming a demonstration that it's unreliable/you don't know what you're doing. (not that browsers make this stuff easy... but still.)

Perhaps the webfont on that page uses a subset and maybe the author of the page has the font also installed locally, so fallback would choose the locally installed font. I can see how it could happen without noticing and most people would not spot a single wrong character on the page when looking at it.