Glory to them if true, but this particular ship had 6 independent fire control radars for their close-in weapons systems, which are automatic. The UAV perhaps destroyed the sensor system of the long-range anti-air missile system? Either way, obviously it worked. I am a huge skeptic of anti-missile weapons since they have performed extremely poorly in limited practice.
I'm not sure about the terminology, but yes, it sounded like it was the long-range defense system radar that was taken out, because that was deemed to be the one most likely to shoot the missile down. Their close-range stuff was supposedly operational, it just didn't work as well in practice as it did on paper.
BTW, it should also be noted that the missile that took it down was - again, supposedly - Ukraine's very recently (2020) developed P-360 Neptune; and they have very few of them in service. They haven't been used until this point, so the assumption now is that it was a long-running operation in which Ukrainians bided their time and patiently arranged for all the pieces to be just right before making the move - and it paid off big time.
