The mass media are a perfectly acceptable source for Langan's (or Marilyn vos Savant's, or anybody else's) estimated IQ. Estimated IQ is not "actual measured IQ"; Langan and many others are on record as saying that IQ cannot be reliably measured at this level. In any case, such claims do not pretend to be scientific or mathematical facts, but are merely statements about why the subject is considered notable. That Langan is considered notable for this reason is a well-established fact, and does not require publication of his personal scholastic or medical records.