I don't suspect guerrila marketting here, but more people interested are finding or remembering things and posting them because it's topical.
Guerilla marketting for Dune would be the reports of worms in the local park's new sandpit. Sadly, park department shut that down by replacing the sand with tan bark. :(
I suspect Dune is loved by a large chunk of the HN demographic. In fact, IIRC I first heard of Dune in an Ask HN thread “what books do you recommend?” where it was one of the most recommended books.
(TBH, I love Dune enough that I don't care. I just find it suspicious.)