I'm flattered James!
I think there are several things at play here. First, I use and always have used, the Left Center Right panning method that Terry and William endorse. This gets everything out of the way and leaves a hole between the right (or left) and center images where we can slip things, like that tricky acoustic guitar or other hard to hear things.... So I would suspect the guitar is panned into "no mans land" as Terry calls it.
Then, The acoustic gtr is EQ'd to death. I completely remove ALL bottom end using a high pass filter as high as I can stand it. (Possibly as high as 250hz). Then as I mentioned I use the BBE Sonic Maximizer to boost the high end harmonics to make it even more tinny... Then on top of that I recall boosting at 3k on the EQ as well... If you listen to the acoustic track on it's own it is completely top end and tinny as hell... sounds horrible actually.. But in the mix your brain actually fills in the bottom end, and/or the other instruments like bass guitar hold it up... Same with the electric guitars on this track in fact (high passed at approx 200hz)....
You don't need too much bottom end on the guitars in a track like this.. let the low end instruments have the bottom, the mid instruments have the mids, the high ones the high end etc.
I will usually "EQ at the amp" knowing that I will carve later anyway.
As for mic placement... I never worry about that too much... I live by an old rule that you put a mic up and if doesn't sound bad don't move it around trying to find a "sweet spot" just roll with it... (If it sounds good leave it alone) I rarely sweat mic positions... But that said I suppose the mic was about 12 inches out from the guitar, and at about the 12th fret, as high from the floor as the neck itself, looking at the hole.
So it's a combination of several things... but if I had to put my finger on only one it would be the BBE plug, and rolling off the bottom...
A little chorus for "shimmer" won't hurt either... If things "move" a little this helps cut as well.
PS: I would lose the stereo micing if mixing into a rock song.. Takes too much real estate. If I go for stereo I will pan the DI to one side and the mic to the other sometimes as well. Blumlien works well for solo performance too. But usually mono for rock songs.