I read this differently. He says:

I asked if there was a "natural man" in the court room with a claim against me?

(The "plaintiff" on my paperwork stated "The People of the State of California vs. MY ALL CAPS NAME")

So... I think he was trying to claim that only a natural person can be a plaintiff, and because he was sued by the government - which is not a natural person - the whole thing should be invalidated.