Actually, Mandarb, if we were talking tabs here, I would agree w/you, but the OP was specifically talking about Uncle Rod's boot camp & the apparently common practice here & elsewhere to list a chord as a "string" of 4 digits w/each digit representing the FRET # to press such that a G7 == 0212 which if you were strictly "talking TAB" would be just the opposite as G7 == 2120
Heck, even Jake Shimabukuro tweets chords like Uncle Rod does in the Boot Camps.
I think we are saying the same thing - 1st string (A), 2nd string (E), 3rd string (C), and 4th string (G). It is the visual aspect that can be confusing when looking at a tab sheet....
strings are noted below
------------------(string A)
------------------(string E)
------------------(string C)
------------------(string G)
a G7 looks like this on TAB
----2-------------(string A)
----1-------------(string E)
----2-------------(string C)
----0-------------(string G)
The numbers represent the frets that should be pressed down....so I would play the G7 noted above with my index finger on 1st fret (string E), my middle finder on the 2nd fret (string C), and my ring finger on the 2nd fret (string A). The 4th string (string G) is played open.
Hope this helps the OP and clears up any confusion.