How can you contextualize what Bob Mayer says in his blog about the "rule of seven" using in the following link the plane crash example?

You can find it here: https://bobmayer.com/day-140-2020-pandemic-why-most-disasters-only-occur-after-seven-things-go-wrong/

I don’t even know what to say. I found this concept on his novels, but I never thought it could be true. :$

Anyway, I need you to tell me EVERYTHING you think you can know from this, all right? Thank you in advance.