There’s no reason to believe that one program is inherently representative. sudo-rs eschews dependencies and so is likely to be higher than most programs.
Furthermore, 170 uses in a 200 line program vs a one million line program are very different. I don’t know off hand how big sudo-rs is.
Even in embedded OS kernels, it’s often around 1%-5% of code. Many programs have no direct unsafe code at all.
That’s “a lot” in my book.