From the elections website

Election advertising does not have to be removed from social media as long as:

• it was published before election day
• it’s only made available to people who voluntarily access it, and
• no advertisements promoting the page or site are published on election day
• you don’t repost the material on election day, even if the information was posted before election day.

So what I posted looks fine; as long as I don't repost or link to it on election day

Source: elections.nz