I suspect it's an oversight on D'A's part, and it's surprisingly labor-intensive to update webpages.
FWIW; the .12-52's would be lights in 6-string parlance, and the .010-.047's were "extra-lights" ("XL350"), Guild actually did spec 'em on my F65ce, but the corresponding .010-.049 12-string set was call "L1250" for "light" in the '98 catalog:
https://www.gad.net/Blog/2010/07/26/guild-gallery-catalog-1997-1998/#gallery-25
So suspect the existing convention was "grandfathered in" when they introduced EXP's, if you follow my drift.
I don't think Guild themselves ever spec'd .12-.52's after that (and even for at least 4 or 5 years before), even in New Hartford, where the full-size dreads and jumbos did get mediums.
yep, 2013 F512 specs show EXP38's:
https://web.archive.org/web/2013061...s/details/?partno=3852900821#simpleContained4
Note New Hartford also saw the renewal of the Guild-D'A relationship after a separation from approximately '04 to '10, and the first use of coated strings.
Got it, my bad on over-looking that those 12-52's were for 6 string. That said, I still find it a little odd that they define Light/Medium differently for 12-string sets across the EXP and non-EXP lines.
More soon!