I've never read this guy's writing before but in this article I think he is way over-intellectualizing things. Meaning is whatever you want it to be. Some people find meaning in easing the suffering of others. Some people find meaning in raising children who will raise children, etc. even if in the fullness of time they will all cease to exist. Some people find meaning in really good sushi. It doesn't need to be any…
I'd say that meaning, as a cognitive emotion, is heavily dependent on what "facts" we hold to be true and what stories we tell ourselves. Most people are not telling themselves stories about the entirety of time and space, so it literally has no impact on their experience of meaning. Death, on the other hand, affects us all; everyone has an attitude towards their own future and eventual death, however unexamined it is. That doesn't mean everyone has the same attitude, though. Some people would like to become immortal above all else, while others are not bothered in the slightest by having a finite lifespan, or believe that their "spirit" is somehow infinite.
It is possible to intellectualize about where meaning comes from in order to bring more into your life, as a kind of therapy; see https://en.wikipedia.org/wiki/Logotherapy