Metal Gear Solid fans have noticed a detail in the screenshots of Metal Gear Solid Master Collection Volume 2 that may explain how the PS3 mentions are handled in the new port of Guns of the Patriots.
Metal Gear Solid 4 has become something of a cryptid among the Metal Gear fanbase; it's the only game in the franchise to remain an exclusive, and it was long thought to be unportable because it was built specifically for the PS3.