That's well spotted. Nagel's The View from Nowhere did influence how I think of absurdity.

I'm not sure how well Nagel's solution works, though. The question is whether the sense of life's absurdity does belong to a mere human perspective, or whether it's an inkling of a higher, transhuman one, in which case it might matter more after all. If the universe speaks more for itself, as it were, when it speaks through our sense of the absurd (or through what Spinoza called the God's-eye view), then that existential perspective is less easily shrugged off.

But indeed, the best life would have to be lived with much irony. Richard Rorty said the same thing. And that's what postmodernity is largely about.