Um, it's useful for other Tor operators to know what to look for if they find their servers rebooting / going down for a while without good reason.
Also, warning people not to use those mirror sites is a responsible reaction to possible compromise.
Also, warning people not to use those mirror sites is a responsible reaction to possible compromise.
Other than that, I agree, I don't see what the point of this would be. Especially when there was some early warning. It is possible that the warning from a few days ago is entirely unrelated to this incident, though.
Maybe this is related to the Sony hacks, the authorities could know about a forthcoming data leak or threat. Taking away a major source of anonymity could prevent the information getting out.