Well, you're not starting of to great by randomly claiming that it's a security issue that it's written in C++. It's not really productive. A lot of software is, for better or worse, written in C or C++, that's not going to change.

For years people have been yelling: "It's broken because it's written in C/C++". That same "attacks" was made to promote Java 20 years ago.

Sure, maybe they could have picked a memory safe language, but they didn't. Perhaps because they know C++ and doing the same project in a language they're just learning would result in a ton of other bugs. They even write that they hired a few brilliant C++ programmers, so chances are that they know how to safely handle memory in C++.