Context for anyone who's not aware:
Nerd sniping is a slang term that describes a particularly interesting problem that is presented to a nerd, often a physicist, tech geek or mathematician. The nerd stops all activity to devote attention to solving the problem, often at his or her own peril
Here's the xkcd comic which coined the term.
In the Gwern quote, what does "Even the dates are more or less correct!" refer to? Which dates were predicted for what?