I heard the same as he claimed — but didn't think it went before the 1833 printing. What we really need to check is the 1831(?) mss in the JS Papers. I think you'll find if the line's there it's been supralinearly added (JS added & cleaned up quite a bit in those revelations before printing them, sometimes).
Then again, maybe I & he have heard legend. But I'm pretty sure I remember that coming from a dependable source (like Bushman).
mutu.