That's not at all what this is. Tauri is written in rust but doesn't require writing any rust. You can use just frontend js, or node on the backend, or rust, python, c++, etc.
Wails needs to write Go for the backend side, I would assume Tauri needs Rust to do backend side work too, after all UI is just the surface and we need the backend(or system side) code to do the heavy lifting. If the frontend is JS/HTML/CSS and the backend can be any language of choice, what is Rust doing here then? I must be missing something.