I'm not seeing a [U]new[/U]
Backwater lesson in the Songs list. The lesson referenced in this thread is just short of six years old and has a very low Difficulty rating (two guitars). It makes me wonder if I'm looking at the same song lesson as the one you're working on.
Regardless - approaches, methods, and techniques change over time. IMO, the standards set by currently produced lessons show improvement over the older lessons. I certainly see no evidence of rushed-to-post song lessons.
GT encourages posting of corrections and contributing accurate notation is appreciated by all of us. It's my perception that corrections are posted fairly quickly so if you see some errors send in the corrections before I start working on the song. :D
"It takes a lot of devotion and work, or maybe I should say play, because if you love it, that's what it amounts to. I haven't found any shortcuts, and I've been looking for a long time."
-- Chet Atkins