I gave it a shot here and, welp, same issue. But, I just realized…I think autoplay would defeat the purpose of this script, i.e., it’s designed to not load the YouTube API until it’s been clicked.
That is, it is “fast” by delaying the YouTube API from launching until click. Thus, the
autoplay: 1 argument won’t be run until after a click, at which point it’s already sent the play command.