So basically something in the class of 737AEW will have difficulties getting data on targets of the Harpoon/Kh-35 class and will detect them at about let’s say 100km?

Also, if the data is so unreliable, I presume that it is useless for guiding ship-based IR homing missiles over the horizon against the sea skimmers (relying purely on the data from the 737, I’m not sure if the airplane could even communicate with the missiles directly)?