Tawhidu lRububiyyah is the category that the Mushriks confirmed i.e. belief in the Oneness of Allah's actions including creation, providing sustenance, planning, giving life, causing death, and other actions as stated above.
This category of Tawhid stands as refuting evidence against them and their rejection of dedicating worship solely to Allah since the former necessitates and testifies to the latter.
Therefore, Allah made their confirmation of that category refuting evidence against them saying: Say: "Will you not then be afraid of Allâh's punishment (for setting up rivals in worship with Allâh)?" In the other Ayahs, Allah condemned them that they did not reflect or receive reminders.