Did Bolton fulfill all the demands to delete content that would compromise US security? Is there anything specific in the book that would be of interest to America's enemies that they don't already know?
It appears that the book mainly compromises Trump's character and so that alone could be damaging to US security in that it reveals Trump as not being of any consequence on issues that would need to be kept secret.
For example, if there was any question on how Trump would decide on national security issues, there can't be any room for confusion. Trump lacks any concept of what is required of a US president and so knowing that is of use to Putin and Xi.
That alone could be the compromise of US security!
As for Bolton, he's always been America's leading hawk and his falling out with Trump speaks loudly on Trump's collusion with both Russia and China for his personal aims of being re-elected.