The "Enigma" variants became popular in these circles because anti-cheat vendors began scanning for known default PCILeech device IDs. Custom firmware like this was an attempt to evade those signatures.
: This indicates a raw binary file intended to be flashed directly onto the FPGA’s configuration memory. pcileech-enigma-x1-top.bin
is a mid-tier DMA hardware board, typically based on the FPGA. The "Enigma" variants became popular in these circles