alt Hacker NewsThesis by publication is only one way, and not even the most common in many fields. I can't access the actual text of this thesis, but the abstract sounds more like a monograph and I don't see any author publications before the thesis that would lead me to think otherwise.
What gus_massa was describing doesn't sound like thesis by publication. TBP usually uses the papers verbatim with some added material to make them cohesive to the overall thesis argument. What they described is more like repurposing existing material in a thesis format, which is indeed very common.