alt Hacker NewsPart 1 was interesting; it isn't clear why he split that into a Part 2 since it adds little to the story and is a paragraph long.
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Part-2 is more than a paragraph and is logically distinct from Part-1. In this, Raymond actually gets the crucial clue from another colleague's debugging efforts which leads him to identify that the bottom byte of HMODULE of the DLL gets overwritten by <something> which is the root cause of the bug; viz.
The “DLL unmapped from memory” crash is just an alternate manifestation of the “somebody is writing 01 bytes to places they shouldn’t” bug. The original bug had a larger bucket spray than we initially thought.
Part-2 is the essence of the solution while Part-1 is a series of investigations and inferences.
Might have been an “I need to look into this” segueing into “ never mind”?
I assume the fact it is a third party application means debugging gets harder, and the business case for doing so is weaker/none.
But I would hope that some kind of reverse debugger triggered on one of these crashes would make it pretty simple to say "who wrote this 01".