It appears the site couldn't handle HN traffic or maybe the site owner took it down. Regardless, a project like this needs a lot of thought put into it to be something that people can rely on during times of crisis.
If it can't handle a surge in traffic from HN, it won't be able to handle a surge during natural disasters.
Something working after a spike doesn't tell you much anything about how it did during the spike. At best, it's a hint that maybe the server did not physically burn to the ground, but even that is not for certain.
If it can't handle a surge in traffic from HN, it won't be able to handle a surge during natural disasters.