We preserve our work, including the ideas we have moved beyond. A record you stand behind includes the parts that did not survive contact with the evidence.
The record
Why keep it
Organisations usually handle a change of mind by deleting the evidence that they ever thought otherwise. We think that is backwards. If the standard is a record that can survive being seen, then our record has to include the answers we tested and set aside.
Everything here is dated. Nothing here is disowned. The book is published whole, the original claims are still readable, and the reasoning that moved us is published next to them.
That includes the parts we would write differently now. The book calls unplugging the only effective way to mitigate the risk, and describes a future in which machines serve humans. We do not make either claim today. Both are still in the text, where anyone can check them against what we say now.