To be honest, I could not find any indication that they are not valid.
Then because I did not know, I went reading... and found this:
Can I petition Parliament?
Any individual or organisation can create a petition. You do not have to be of voting age, be enrolled, be in New Zealand, or even be a New Zealand citizen. If you want to start a petition on behalf of an organisation, you must be able to show that you have its permission.
To be honest, I could not find any indication that they are not valid.
Then because I did not know, I went reading... and found this:
https://www.parliament.nz/en/get-involved/have-your-say/guide-for-petitions/
Hence if anyone can create, anyone can vote.
Will add this to the post.
Done
π