The reason the theme entry Fooyin::StatusLabel or the base font is not applied by Qt automatically is because StatusLabel is only a compile-time alias of ElidedLabel. At runtime, it's still ElidedLabel.

As such, the fix may be as simple as:

class StatusLabel : public ElidedLabel
{
    Q_OBJECT

public:
    using ElidedLabel::ElidedLabel;
};

Yeah that's a better solution; changed.