> Could a creature that simply evolved to survive and reproduce possibly have a conceptual model underpinning it?
Yes. Obviously. I can create plans and think on them. I can think without the need for an internal monologue or talking to myself. This has nothing to do with modalities either: I do not think through text. I use text when I do as a way of conveying the thoughts I already have.
Anyone who claims we don't have the ability to form concepts in our head distinct from the medium in which they're transmitted is saying we're effectively ears, eyes, and skin. That the modality is what is important for intelligence.
This is clearly false, and academic silliness aside, yes—emphatically—humans and intelligent agents have internal concepts and models of the world.