This article is not really specifying if Rust is compared against "Modern C++" or "Old School C++". The only thing we can assume is that at least part of it is "Google C++".
Maybe we would see similar effects adopting Modern C++. Maybe not. The article doesn't tell us.
The statistics from projects that have adopted Rust and measured the effect say otherwise. See https://security.googleblog.com/2025/11/rust-in-android-move... for example.