it is known whether execution is really made in AE or not necessarily? I have no clear solution how it could be achieved, yet the only 'theoretical' option I can think of is with Text Animation engine and expression range controls. Only Dan could shine a light on this! (:
I would rather say it wasn't done in AE after some researches. Actually, I don't really care in which programm it was done, I am more interested in the way how to recreate this by myself without boring animation of each letter.
Btw, who is Dan?