The tool is Calligraphr (.com). Would love to share the font but apparently I’m not allowed to by CC (tried with an other file extension but nope).
Made a text layer with a lot of footprints. Copied the path from the dashes layer to path text layer and adjusted that path with pen tool for better fitting of the footprints (and added some spaces here and there).
Applied the Typewriter effect and: done!
Thanks again for this trick!
In the attachment one of the animations.