A Bitmap Opentype?

I came across Fontself today (via 30gms), and it looks like a promising project. From what I can tell, it’s like OpenType, but for bitmap fonts, but looking at it I’m wondering how much of each letter is rendered procedurally. It certainly implies that there is some procedural stuff going on there, but they won’t come out and say either way and most of the comments are in French (I’m still learning). Take a look at the examples page to see the state of the project.