I disagree, the GUI layer is far from behind a safety critical component, and C++ is a battle-tested choice for everything from GUI, videos games, to industrial applications. If C++ is safe enough to control airplanes and nuclear reactors when used well, it is certainly safe enough for something as trivial a GUI.
The article also fails to mention frameworks like Qt, arguably the best way to write GUI apps in 2026. Qt is native (C++), has built-in memory safety features (but no GC), and is cross-platform.