Why "2005" specifically? This likely refers to a particular group’s rip of the second film or a repack of the first film with 2005-era codecs (like XviD or DivX). Many open directory indexes were snapshots of a user’s hard drive from a specific date. If a directory was last modified in 2005, Google cached it, and the link survived for years.
If you mean the from 2005, here’s a structured outline and key sources to build a solid paper: index of pirates 2005
: It was one of the most expensive adult films ever made, featuring high-end special effects and a full-sized pirate ship. Why "2005" specifically
and was even released in an R-rated "mainstream" version for wider retail distribution. The Global Index of Digital Piracy (2005) Google cached it