I thought people would be too bored of it to mention. I've heard it proposed dozens of times as a possible explanation. I should probably spend less time with philosophy majors.

Anyway the strong version of the statement is much more interesting. Not only do naturally evolved intelligences all have values that for some reason or another choose to rather let it all end than endure existence, it also means that they never spawn AI's with values sufficiently radical to disagree. The mind space that encompasses is mind boggling.

Either its hard for a civ to build a AI with truly alien values, they go extinct before they can build AIs (different argument), decide to kill themselves before doing so (odd) or nearly all possible minds agree nonexistance is good.

We may have very very weird minds if the last option is the answer.