The most hilarious aspect of this story is it took nearly two months before anyone noticed he was gone.
That's probably not super crazy for a reasonably senior writer working on "longish" form stuff. While a month is probably a long time, I wouldn't be surprised if a week or two usually passed without touching base. It might take a couple of those "week or two" cycles to notice someone hasn't checked in.
The article also says it wasn't unnoticed, and that they tried to reach him several times in that period.
In this case, it turned out to be something else, but that's why I wouldn't have rushed to fire if I were in HR at the Verge.