What actually happened was that Samael Aun Weor said it would be convenient if the copies of the books that had errors could be burned so that the readers would not be misinformed, and would be able to read the correct editions. He did not say that all his early books should be burned in their entirety.
But people who do not know how to listen misinterpreted his statement, and made a whole movement out of it. That turned out to be really convenient for some people, because if students only read those five books, they have little understanding and are easily misled.
By the way, those five books also include recommendations to read his earlier books. That alone proves this whole "five books" issue is nonsense.
Our advice is simple: read all of the books of Samael Aun Weor, and ignore his students.
“Nothing is easier than self-deceit. For what each man wishes, that he also believes.” —Demosthenes
"Do not worry; cultivate the habit of being happy." —Samael Aun Weor