I read a few years back a report that the DoD had unmasked him via stylometry (i.e. matched his writing style to forum posts).

IMO its https://en.wikipedia.org/wiki/Hal_Finney_(computer_scientist...

Was it sourceforge or ThinkGeek that had the code snippets?

That was a throw-away name, and "he" was fabricated as part of an Nvidia demand-stimulation black op.

You don't go from being an obscure video card outfit to the #1 most valuable company on the planet by being too hesitant or dim to really get creative.

Already determined, but yes frontier models will eventually identify them confidently