The freeman thing stems from a fundamental misunderstanding.
They think that a birth certificate is actually a berth certificate so when you are born you are registered as a boat… yes it actually is that crazy
They mention maritime law quite a bit because of this, if you realise (like most sane people) that a birth certificate is actually a birth certificate then most of the freeman logic crumbles away
There are all sorts of misunderstandings with it, most of it intentionally so, it would be hilarious if I didn't have to deal with it once or twice in life when people have owed me money.