Well, the way I read it, the chord (?) he's holding is made up of (from bass to treble):--

G# - C – D – G – B - *BUZZZ* (finger more or less on top of the 4th fret, neither G# nor A).

Dunno what you call that – it ain't in any chord book that I know of.

Got a way to go yet before he's ready for Austin City Limits. . . .

Don Firth