Definitely not a lawyer, but I would think the counter argument might be their is no judgment from New Zealand yet so the libel tourism law would not apply. For example if after this guy is unmasked it turns out he is living in the USA and is found guilty in NZ but would not have been guilty in the USA then they would not order extradite/use us banking system to enforce the ruling. However if the he would have been found guilty in the U.S. (say he is the CEO of a competing company who never even worked for the company.) then the US would enforce the NZ judgment. It least that is my best guess