Earlier quoted context omitted.
For what it’s worth, the Rust driver pointed to in the article doesn’t have a single unsafe block, raw pointer, pointer arithmetic, or any of those other things you mentioned. It’s a simple driver. But it’s also possible that rust code doesn’t necessarily have to copy the C code line for line - the C way of doing things with pointer arithmetic may just not be necessary with the abstractions rust provides.
It's basically a "Hello, World" type of driver. A "Hello, World" in C or Rust typically also doesn't involve unsafe blocks or safety issues.
char hello[5] = "Hello";
Even complex driver in rust will have very little amount of unsafe because of correct use of (often zero cost) abstractions. And it is much less mental drain to check only that, than when every single line is a minefield that could hide undefined behavior