Distortion, in itself, is a specific routine and handling for the moving pip's gimmick, which has been around for years.
I don't mean to speak for W:H though, but I believe he already mentioned this, so i believe I m just repeating and paraphrasing.
I believe it was also mentioned that the moving pips are traced back to the '70's, mind you I have a book that mentions them in a repulished section from, I believe, at least the turn of the century. The last one, not this one, 2000, lol.