https://doc.qt.io/qt-6/qtquick-modelviewsdata-cppmodels.html

The page starts by a link to a video showing how to do model(C++)/view(QML) but this dates back to Qt 5 and uses setContextProperty(). I think the video should be updated to the Qt 6 way of exposing the model like explaining here https://doc.qt.io/qt-6/qtquick-modelviewsdata-cppmodels.html or at least includes a warning about context properties: https://doc.qt.io/qt-6/qqmlcontext.html#setContextProperty.