When Sidney Blumenthal testified before Ken Starr's Grand Jury, he emerged from the building, stepped up to the cameras and said, "I told them ..." and reeled off his supposed testimony. Of course, later events proved that he lied his ass off about what he actually said in his testimony. So is the fact that he made up what he said about his testimony what saved him from being in violation of some law?
Federal grand jury testimony is literally a fact-finding mission to ascertain if enough evidence exists to bring forth an indictment. If there is no indictment, all lips are sealed for all time.
That said, as long as Sid Blumenthal did not state what actually and substantively transpired in the jury room, and it was not challenged...then he got away with it.
Gotta watch those legally crafted statements. It's all in the details.