Could/should we re-imagine "shields" from being a skin-covering forcefield and change it into the name of Starfleet's standard CIWS system?
Possibly so - but the Narada
also had "shields" according to our heroes, and never demonstrated any sort of CIWS.
Also, the Kelvin
crew wonders if their shields were even up after Nero makes such short work of their ship in the first attack. How could they not know whether the CIWS system was up or not, when the bridge has an actual see-through window opening to the very lightshow that this CIWS system created?
Narada's torpedoes are described as "powerful and advanced" but there doesn't otherwise seem to be anything special bout them other than the clusterbomb trick.
...And their ability to go through shields as if they weren't there - an ability either related or unrelated to the submunitions trick. Certainly it could be that each warhead individually is "powerful" and "advanced" by 23rd century standards.