A letter from Kurumi-an-pan:

(Omitted) I would like to hear your opinion. (A certain psychic person, regardless of the circumstances) claims to have erased the guardian spirit of a certain person who is repeatedly having extramarital affairs, and the soul of the client. Is that true? (Omitted) Could my own soul also be on a path to disappearing? (Omitted)

I don't know that person, so I don't know the actual situation, but based on what I've heard, it seems that person is undergoing appropriate learning. Therefore, "disappearance" is likely a metaphor, and it's probably best to understand it as erasing the memory from the client's consciousness, or erasing the trauma. While "disappearance" is not impossible, the possibility is low, so there's no need to worry too much. There are people who can do that, but they are not many, and it's not guaranteed to happen. However, there are people who, unfortunately, may encounter such a being, and there is a risk that it could happen to them. It is truly rare.