He does admit that many of the people interested in seasteading are libertarians though.

"Personally, your author’s views definitely match the “libertarian” label. But don’t be deceived into thinking that seasteading is just a means to libertarian ends. While we began exploring it as part of trying to achieve our own vision of an ideal society, it turned out to be a much, much bigger idea."

http://seasteading.org/book_beta/Why%20we%20need%20new%20societies.html