yes, they believe it's one of the "in plain sight" pieces of evidence - that when you're born, you have to have a berth (maritime) certificate that makes you like, property of the state or something because you're recorded as "docking" with the country (which is actually a corporation that wants to own you and use your cache of money they hide from you that you receive at birth), and "they" get away with the ruse because us normal rubes just never think to ask if they said "berth" (maritime) or "birth" (reproduction). not even joking lmao

it is a funny pun, too, but they really think birth certificates are, in fact, secretly "berth" certificates for them in maritime trade law, which they believe is the only real law, in which we are all like.. sovereign vessels that have been duped into signing away our independence.

They use it because it is a nautical term. There is no pun.