Linux, the kernel, doesn’t operate in isolation. The system under test was Ubuntu, which comes with specific packages, package versions, patches, kernel configuration, and so on. It is reasonable to say that the combination between this specific operating system and hardware led to the observed outcome. Different combinations of software and hardware may yield other results or replicate the same outcome. The certainty of these outcomes can only be established through testing. Therefore, your outrage seems unwarranted, and your assertion is not only baseless but incorrect.