In this case, it is just idiotic sovereign citizen ideas.
He might believe the court does not have the authority to hear the case, the problem is the court and any other court he might appeal the decision to will disagree. The same for police and other enforcement agencies so what he believes will not have an effect on what happens to him.
There is a possible exception to it and that is what a jury does. There could be someone on it that agree and vote for not guilty.
Most legal systems have elaborate rules setting out which kinds of cases can be heard by which courts. The ability of a court to hear a case is called its jurisdiction. In the US, the rules are traditionally divided up into “personal jurisdiction”, i.e. the question of whether the court has authority over the people involved in the case, “territorial jurisdiction”, i.e. the question of whether the court has authority over the locations involved in the case, and “subject-matter jurisdiction”, i.e. the question of whether the court has authority over the particular legal issues that the case is about.
Subject matter jurisdiction means that a court (either state courts, or Article II/Article III federal courts) has specific jurisdiction (authority) over a matter because of the specific issue at hand. That jurisdiction/authority is derived from a law, statute, or regulation that specifically grants the court that authority.
(For example, Bankruptcy Court hear bankruptcy cases, Admiralty Courts here maritime cases, Federal Courts for Federal Laws/Statutes, etc…)
In regards to Sovereign Citizen matters, just ignore what they say because they are spewing word salad they have memorized without having any context or knowledge of the actual terms they are espousing.
[Edit – clarification]
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