Earlier quoted context omitted.
It depends on what you mean by "true" indie games. Valheim [1][2], by any reasonable interpretation of the word, is a completely indie game. It was made almost entirely by a single guy in his spare time after work, well at least until it blew up and he was able to expand the studio. And it was released with little more than a post on itch.io - 'Hey guys here's my game and a couple of pics. Let me know what you think.…
don't forget Rimworld. One guy making a huge and sprawling game that ignored the studio sensibilities and became hit (and a couple of memes).
I mean, it's strongly 'inspired' by dwarf fortress, so any heterodox design credit mostly belongs there