Statements like these only serve to polarize people, not encourage them to write safer code / use safer languages.

There are many places where C/C++ (and many other non-Rust languages) are still used, and where it would not be feasible at this time to fully rewrite them in rust.

Modern resources like the OP posted should be encouraged, as they actively teach about proper use of the language, and foot-guns to avoid (e.g. don't use c-style strings + strcpy, use smart pointers, etc).