I can’t tell if this is sarcasm. The article says not to waste time getting food at the event, and to just bring something with you. Seems like decent advice.
Its' one of those rare instances where it is both because it is technically correct, while not being practically correct.
It is decent advice, but not survival advice.
As I'm sure you're aware, "How to survive X" is very common shorthand for how to have the best experience at X. No one actually thinks you're going to die at FOSDEM if you stand in a food truck line, c an't get into a session, or don't stay near the city center.