I got everything working except the last step where you run the server. The commands don't make sense as there is no /dist folder in either the file1 or file2 server files or a .jar file on github.
Is it a slim of fat ps2? Either way the best method to play a japanese game on an american console is with swap magic. If you have a fat ps2 you can hook up any ide hard drive to the network adapter and install the game to it.