Banner in experiments page should account for the presence of test and private devices. <img width="548" height="221" alt="Image" src="https://github.com/user-attachments/assets/6c3dd1cf-a5a9-40c1-b17e-349b833f9a92" /> A potential way of doing it was already described by @timcowlishaw: "This experiment has 3 devices, but 2 are private". Or a similar caption.