The advanced canon, its radar and its sophisticated ammunition among other things..
One of the technologies is the
Active hull cooling (AHC) technology that reduces the IR signature of a ship by using an onboard system of water spray nozzles to coat the hull and superstructure with cooling seawater. The AHC is controlled by the Onboard Signature Manager (OSM) that directs the cooling spray onto heated ship surfaces.
https://wrdavis.com/docs/Naval Infrared Stealth Technology.pdf
Globally, various methods are adopted to reduce the temperature of exhaust gas and duct which causes IR signature. NSTL designed eductor–diffuser-type IRSS devices is one of the technologies for reducing temperature of exhaust gas and duct. Such type of devices has been installed on diesel engine exhaust systems of a number of front-line ships. In this system, reduction of temperature is achieved only by addition of cold atmospheric air. For further advancement and enhanced cooling of exhaust gas and duct, water can be injected in proper pattern with suitable water injecting nozzles at various points inside the duct.
https://link.springer.com/article/10.1007/s40032-021-00788-3