FWIW, when I have done similar practice on real-life memories rather than dreams, I have sometimes checked my recollection of past events with other people who were there, and they have agreed with my account. Of course they could be influenced by my recollection, but I have sometimes recalled details which I have reason to believe that they would otherwise remember much better than me. For example, a friend showed me an episode of a TV series that she had seen several times before, but which I had not. The next day I used this kind of a technique to bring up details about the plot which I didn’t remember initially, and she confirmed that I remembered them correctly.
So if the technique seems to provide accurate recall rather than confabulation in a non-dream context, it would seem like a reasonable default guess that it would provide accurate recall in a dream context as well.
FWIW, when I have done similar practice on real-life memories rather than dreams, I have sometimes checked my recollection of past events with other people who were there, and they have agreed with my account. Of course they could be influenced by my recollection, but I have sometimes recalled details which I have reason to believe that they would otherwise remember much better than me. For example, a friend showed me an episode of a TV series that she had seen several times before, but which I had not. The next day I used this kind of a technique to bring up details about the plot which I didn’t remember initially, and she confirmed that I remembered them correctly.
So if the technique seems to provide accurate recall rather than confabulation in a non-dream context, it would seem like a reasonable default guess that it would provide accurate recall in a dream context as well.