Another angle is to correct the user's query if they confused the console version. PlayStation 4 emulators like RPCS3 are the closest to what they might be referring to. If that's the case, explaining that emulating PS4 games is technically challenging and currently not feasible with existing emulators would be important. It's also worth mentioning that no commercial PS4 emulator exists yet, so any claims of PCSX4 being available should be addressed as misinformation or non-existent.