The secrecy surrounding the health of superstar CEOs reminds me of the way the major sports leagues used to handle injuries. NFL teams, for example, used to be quite cagey about their players' health---a practice you could easily defend on the same grounds people use to defend CEOs like Jobs. The problem is that, propriety aside, injury information is extremely valuable, especially to gamblers, and the result was that oddsmakers went to great lengths to acquire injury information surreptitiously (by bribing trainers, etc.). Eventually, the NFL (and other leagues) decided to stop denying reality and institute formal injury reports; now all teams are (relatively) forthcoming about players' injuries.
As with athletes, and like it or not, CEO health information is often quite valuable. Vilifying those who seek to ferret it out is just shooting the messenger.