"If you haven't heard of him what's the point of commenting."
The point is to demonstrate that many reports of deaths in the media relate to people of whom few others have heard. I don't think I'm alone in having never heard of Mr Bourdain. Instead of the in the national press/telly, Mr Bourdain's demise may have been better covered in a more restricted way, say by means of an obituary in "Fancy Chefs' Monthly" or whatever specialist publication is appropriate.
It is equally pointless to post "what a great guy, RIP" (or similar) but I wouldn't criticise anybody for doing so.