Yes they are expanding at a quick pace as they are the only service in india with some semblance of competent procurement. But they wont be able to deploy this fleet in 3 or 4 years it would take a decade atleast. PN surface fleet inevitably cant scale up as fast so imo focus should in that time be placed on increasing lethality of existing warships by upgrading weapons and sensors and planning out future ships with more capabilities per hull. Before anyone else mentions it yes Hangors and subs in general are primary weapons against such a force and for such a large csg there would probably be 2-3 subs dedicated just to it engaging from different angles but you have to back them up with long range PN shore and sea based attack vectors along with SS and PAF coordination for accurate sensor and comm coverage to coordinate simaleteneous surface, land based, sub surface and air launched attacks from multiple different vectors. Thats how you kill a CSG