Just hope that this isn't a knee-jerk reaction to speculation on new technologies having scary-sounding consequences. Even the term "existential risk" sounds a bit melodramatic.
I did notice for instance when I looked at their nanotech page that they make some references to "grey goo" style apocalypses, even if they don't use the term. Now, while I'm no nanotech expert, I did once get a chance to do some work with one of the groups at my university who were working on it. Said nanotech was exciting stuff that may one day lead to some powerful new cancer treatments, but it didn't consist of invincible self-replicating nanobots or anything nearly so sophisticated, and I'd be quite surprised if such a thing was likely to happen any time soon, if ever. Now it was strongly advised not to breathe the stuff in if you valued your health, but it couldn't exactly eat you alive either.
Now sure, "potential lung disease hazard" doesn't have the same ring to it as "nanotech mass extinction", but I still get wary when governments etc prioritise headline-grabbing issues over the real ones.