I don't think it is healthy to eat carp alive.
In fact, in order to keep the fish fresh, the cooking time is shorter than usual, and the fish is still half cooked. However, some fish have parasites, and it is not enough to kill these parasites by undercooking. Therefore, this diet can easily cause abdominal pain, diarrhea and even more serious symptoms.
Moreover, due to the short cooking time, protein and other components in fish are not completely decomposed. The soup will not be well immersed in the received fish, which is not only bad in taste but also difficult to digest and absorb.
So this way of eating is very unhealthy.