Hi @xkr fair point. But to be clear, the hello-world example was written specifically to be embedded in the gitpitch.com website and it was designed to auto-play every slide so it could be watched almost like a short movie.
Typical presentations are something that the presenter manually steps through slide by slide as they speak. So needs none of fragment timing snippets you came across.
Almost any other GitPitch presentation out there is a better example of what's typically involved, for example, see this presentation from AnyCable: