Unfortunately people conflate single-A games with indie games. (Probably because most indie games are also single-A games)

Remedy is definitely indie, but I'd consider them an AA studio

I think the weirder question to ask is how much publisher/investor pressure should there be for a game to no longer be considered indie. Because it seems to be that there's many publishers that exert little to no control over a game's contents, especially if the publisher is itself an indie game studio. For a while, as well, Microsoft seemed to have not applied any editorial pressure to any of the studios that they bought. So would these games (eg Ori) still be considered indie?

Then yes.

Yes. By those parameters they meet the definition of "indie".

Remedy would be considered an independent AA studio.