This is just making a slippery slope fallacy by circuitous means.

The point of all laws and thus the courts is that each new action provides an opportunity to debate and decide on whether an action is lawful, and thus determine whether it should proceed.

You are arguing that all such decisions would always be decided in favor of the tyrant because they're a tyrant ala a slippery slope: the law exists, all things will be declared lawful, ergo all things are allowed with no further challenge.

This can certainly be true, but it doesn't naturally follow.

Show me a tyrant that doesn’t have rules and laws. Turkey, Saudia Arabia, Iran, China, North Korea, Sadam Hussein’s Iraq, and Russia still have law creating and law enforcing bodies. A good chunk of those countries even hold elections.

Hell, even in medieval England the king didn’t have absolute authority and had to worry about political alliances abcs political support of the other nobles.

You should go read the dictator’s handbook. Think about it from the perspective is the tyrant - there’s one of you. How do you establish control over groups of other people? Just ordering people around doesn’t work. You need to create a power base. You can go broad and give riches back to the people or narrow and give riches to people who have power and influence already. Dictator’s generally go the latter route because you’re not at the whim of changes in political mood and individual problems can be managed easily. But you still need to tap into symbolism and other institutions to lend yourself legitimacy to avoid uprisings.