How does `winrt::auto_revoke` not result in memory leaks?

Version

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Summary

This isn't a bug. Just a question. According to the docs, an auto event revoker will revoke when it goes out of scope. The docs provide this example:

struct Example : ExampleT<Example>
{
    Example(winrt::Windows::UI::Xaml::Controls::Button button)
    {
        m_event_revoker = button.Click(
            winrt::auto_revoke,
            [this](IInspectable const& /* sender */,
            RoutedEventArgs const& /* args */)
        {
            // ...
        });
    }

private:
    winrt::Windows::UI::Xaml::Controls::Button::Click_revoker m_event_revoker;
};

But in this case m_event_revoker won't go out of scope until the class is deleted. The class won't be deleted until all references go to zero. And references won't go to zero until the event handler has been revoked. So shouldn't this result in a circular reference and memory leak? Or maybe I'm missing something.

Reproducible example

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Expected behavior

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Actual behavior

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Additional comments

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microsoft / cppwinrt