“This is admissible evidence.”
The forward to Dreams says parts of it are not based on fact without specifying which parts, so that places a legal deniability around the whole book.
I'm not a lawyer, but from what I have read about evidence, there is not a single thing in Dreams that meets the FRE standards for evidence.
In my view when the truth comes out it is likely that Dreams will provide evidence of willful fraudulent falsification of eligibility by claiming an HI birth (and claiming to have seen his BC attesting to an HI birth) when Obama had knowledge that he was born in Kenya and conspired with others to hide that fact.
Dreams will be proof of intentional lies, not evidence of any Obama biographical claims.