I don't have the magazine to verify, but wikipedia says

> In 2005, Retro Gamer called Snes9x "the best SNES emulator available".[12]

If there was a Retro Gamer magazine writing about SNES emulators, I think it's safe to say some people did consider even the SNES to be retro, 14 years after its US release. My personal experience having used Snes9x around that time, we also considered it retro.

Clearly not everyone though, which is my point in saying what's retro will depend on who you ask.