The real indies are mods and other user-created content like custom maps and probably have always been.
The original Dota on WC3 is an indie game.
Project Diablo 2 is an indie game.
Fallout 1.5: Resurrection which chronologically takes place between Fallout 1 and Fallout 2 is an indie game.
A Pokemon romhack where you can catch every single Pokemon up til a given generation in a single game is an indie game.
Some random Doom WAD or custom SC2 map or Minecraft mod are all indie games.
Everything else is just marketing.