Yes, there is a small amount of PG and/or alcohol and/or distilled water in there so it's not actually pure PG. Juggy's just going with the same verbiage as other "100% PG" vendors are. It just means there's no PG in the base itself.
I got my review samples today, and from what I can see his VG is thinned (though it seems not to effect the ridiculous clouds of vapor it produces in any way), so it's not as viscous and should wick fine in cartos. I just filled a Fluxomizer Deluxe with some Caramel Cafe' and it wicks just fine, so I doubt a carto will have any trouble.