He means that the Mentats in Fallout could themselves be a reference to Dune.
That's still not how recursion works.
They would be mutually recursive if Fallout's was a reference to Dune, and Dune's a reference to Fallout.
This is just a simple reference, perhaps indirect, but not recursion.
founder chiming in: company name is a reference to Herbert's Dune. Been a huge fan forever and think the concept of flipping artificial intelligence towards giving humans computing power is super cool.