That part was a quote from the NSA. He didn't omit it. But I agree his argument would have been stronger if added to the list the most realistic C++ competitors and differentiated against those instead of the more dynamic languages.
> Examples of memory safe language include C#, Go, Java®, Ruby™, Rust®, and Swift®.
> Some examples of memory safe languages are C#, Go, Java, Ruby™, and Swift®.
https://media.defense.gov/2022/Nov/10/2003112742/-1/-1/0/CSI...
Stroustrup quotes the second one without Rust.