He submitted the book voluntarily for review. What did you expect the people who reviewed it to do? Declassify stuff just because he had it in his book? Why did he do that? I'm guessing Streisand Effect.
He submitted the book for review because if the book was cleared, the government would have a very difficult time prosecuting him for anything included in the book after it was published.
However, he was not actually obligated to follow the recommendations made in the review, nor can the government prevent initial publication of the material by his publisher regardless of whether he followed those recommendations.
What the government can do is attempt to prosecute him after the manuscript is disclosed or published by proving that the book violated the law or the non-disclosure agreement that he signed for his pre-1953 government work. The fact that the information is already publicly known would greatly affect that. There's also very little that the government could practically do to his publisher. You should read up on the Pentagon Papers to see how this works in the real world.