I read that as "is c++ still relevant for new features, given Rust and its popularity", not "who is still using C++".

Personally, I think it is still relevant. Many people thought Kotlin could overtake Java, Java reinvented itself with new initiatives/features and was saved from becoming irrelevant.

Rust also has the LLM advantage which is where I think the "if it compiles it works" nature of Rust is easier for manual changes and maintenance when needed.

Java vs. Kotlin is a different matter. It's still an open question if C++ even could match Rust's features, not to say if it (the committee) wants to, and the answer seems to be "no".