Just because you only know three games, it doesn't mean the rest of us do too. Slay The Spire, and Darkest Dungeon, are a couple of really well known and community loved indie games. Both excellent examples of what can be done with limited resources
How does this contradict what they said though? Just because some niche community knows these games, it doesn't make them platform-selling games. Valve had HL2 with episodes, Portal, TF2, CS, and Dota 2.
These are enormous classics, made by small studio is not the same as unknown game. Sold much more than many triple a games, this is a very dry weak take