For a fact, China played the US for suckers during the 90s, and while Clinton was the administration in charge, sucker was a bi-partisan play. Everybody wanted in on that Chinese business opportunity.
I can't say exactly what transpired behind closed doors between Clinton and Berger, but I do know from my own experience in providing ground-level intelligence from the Pacific that the Clinton White House did not want to know anything about China that might trigger automatic legislative political actions against China. There were economic sanctions that by law were to be automatically triggered if China performed certain acts...which they did.
I know that because my team had that kind of information and we had to fight the CIA and the State Department to report it even to military leadership in our own theater. State's response was literally, "Well, you don't really know until they actually launch one." (Our admiral: "Wait...what?") Since no intelligence gets to the president except through the CIA--and they didn't want to acknowledge it--then I can only presume Clinton never heard what we had to say.
So, I wouldn't be surprised if Berger didn't brief it because he knew Clinton didn't want to hear it.