It's actually a very interesting topic that many people have done much good research into. OP's article is a total joke, though. Here is a Steiner quote from a private conversation with one of his student/teachers:

Dr. Steiner: That little girl L.K. in the first grade must have something really very wrong inside. There is not much we can do. Such cases are increasing in which children are born with a human form, but are not really human beings in relation to their highest I; instead, they are filled with beings that do not belong to the human class. Quite a number of people have been born since the nineties without an I, that is, they are not reincarnated, but are human forms filled with a sort of natural demon. There are quite a large number of older people going around who are actually not human beings, but are only natural; they are human beings only in regard to their form. We cannot, however, create a school for demons.

A teacher: How is that possible?

Dr. Steiner: Cosmic error is certainly not impossible. The relationships of individuals coming into earthly existence have long been determined. There are also generations in which individuals have no desire to come into earthly existence and be connected with physicality, or immediately leave at the very beginning. In such cases, other beings that are not quite suited step in. This is something that is now quite common, that human beings go around without an I; they are actually not human beings, but have only a human form. They are beings like nature spirits, which we do not recognize as such because they go around in a human form. They are also quite different from human beings in regard to everything spiritual. They can, for example, never remember such things as sentences; they have a memory only for words, not for sentences.

The riddle of life is not so simple. When such a being dies, it returns to nature from which it came. The corpse decays, but there is no real dissolution of the etheric body, and the natural being returns to nature. It is also possible that something like an automaton could occur. The entire human organism exists, and it might be possible to automate the brain and develop a kind of pseudomorality.

I do not like to talk about such things since we have often been attacked even without them. Imagine what people would say if they heard that we say there are people who are not human beings. Nevertheless, these are facts. Our culture would not be in such a decline if people felt more strongly that a number of people are going around who, because they are completely ruthless, have become something that is not human, but instead are demons in human form.

(Faculty Meetings With Rudolf Steiner Vol. 2, 3 July 1923, p. 649-650)

OP's article author is just a touchy small-minded normie that can't handle the truth.