In my opinion, they don't belong to Helen and weren't dictated to her.
If they weren't dictated to Helen, it's more than obvious that Jesus didn't dictate them. A good piece of advice is not to give advice, and I dare to give you some: don't read it. It's completely harmful to the reader. What they did was take a couple of concepts from the text and put them in a book they wrote, resulting in a book they made you believe was dictated to Helen, when in reality it was written by a couple of people who tried to appropriate concepts they didn't even understand. And today, there are people who continue to teach these inappropriate concepts. Concepts that don't belong to the thinking of the Holy Spirit and Jesus.
The supplement, in all its parts, mixes ideas belonging to the realm of God and the ego. In the end, they themselves projected their way of thinking and their view of the Course onto that writing, and obviously, they are the same ones who changed the text. But since Jesus puts an end to your false creations, their end has come.
I'll give you two examples that will suffice. In one section, it refers to the children of God with a lowercase "g" as individuals, a word Jesus didn't use in the text. It also says that to be a teacher of God, you don't need to believe in God. The one who doesn't need to believe in God is the person who atones. The teacher of God not only believes in God, but God is a FACT. Something else very striking is that the word "atone" is never used. It speaks of forgiveness, prayer, healing, and, where is the Atonement?
The error isn't major, but it does need correction. For now, and only for now, don't follow the concepts presented in the supplements. Follow the text and nothing else. Although the text was also changed, it wasn't in the way the supplements describe it. The strangest thing is that it was first sold separately and then included in the text. Therefore, you have in your hands a modified version of A Course in Miracles along with the supplements, which were written, and worse, conceived by man.
The Course is the other path; the supplements are not. They are egocentric ideas mixed with the ideas of Jesus. Nothing good comes from that.
The Course doesn't talk about as many forms of forgiveness as the supplement. Why would Jesus do something like that? There is only one kind of forgiveness, the true one, which is to overlook something, and the false forgiveness that comes from the ego. He never talks about forgiving to destroy or anything like that. Yet there are innocent teachers who write books and quote him. As Jesus says, all it takes is a little sound thinking on the part of people to realize that the supplements are a big lie. They will realize this when they read it.
Even with the changes they made to the text, you can feel guilty. What the supplements say will only make you feel worse.
At the beginning, there is an explanation about the supplements and their teaching line. Completely tailored by the writers.
None of it is true. Don't waste your time reading something useless, and I would even say perverse. And the perversity comes from the ego.
May God forgive them, for they know not what they have done.