I think they may have gone out on their own there Mike.....
"offering a surprising and very positive “Slingshot” feeling during the cast" comes from their spiel about the Exceed single handers but interestingly a cursory glance through their fly lines shows that their own #6wt 'Experience' line comes in at some 17 grams, the '4cast' at 14 grams, the 'Control' at 14.5 grams and the 'bullet' at 13 grams. Chunky for a 6wt then but that might not be the whole story..... could they be referring to the 'all up' weight of the line over the standard AFFTA spec for 30ft of line minus level tip ??? I dunno.
Perhaps, at a design meeting, a suggestion was put forward that Exceed refers to the over-weight characteristics..... "we call it a 6 but everyone else would call it a 8, feel better about yourself as we have called it a 6
"
H