I know you don’t need magic to be an RPG. I was pointing out that the thing that makes the other two different from RDR is that they have magic, and not much else, so RDR is an RPG if they are. You will absolutely lose a boss fight if your stats are too low (and you aren’t skillful enough). Those stats are largely gun/equipment related though, not just stats on a stat block. The stats are largely diegetic, but they still exist.
Every modern game has stats though. They’re in everything, even things like Doom. I’m pretty sure no one is going to argue Doom is an RPG despite this though, so obviously stats are not the thing that makes something and RPG. They’re a key mechanic all RPGs must have, but they are not the factor that makes something and RPG. I would argue being able to define your character is the thing that makes an RPG, but I think the conversation is lost. I don’t think there can be a “proper” definition anymore with how it’s been applied to so many things.