Unfortunately that's behind a paywall, but there's ways and means of reading it, eg via RSS subscription to NZ Herald.
A couple of notes for the benefit of those that can't read it. Two lecturers in maths education have pointed out that Luxon's claim that there is a crisis is misleading as the achievement data is "based on a new draft curriculum, with a higher benchmark compared to previous years."
ie, the standard for achievement is higher, not the level of maths knowledge declining suddenly. In fact "We’ve been tracking student achievement in mathematics at Year 8 for more than 10 years, and in that time, there has been no evidence for improvement or decline."
More alarmingly for me, a ministerial advisory group was setup which has recommended a new curriculum even while acknowledging there is a lack of evidence for teaching maths the way it proscribes.
That advisory group is chaired by an NZ Initiative idealogue, Dr Michael Johnston and the article almost infers he is basically pushing his own manifesto on how education should be conducted into the curriculum - again, despite evidence it has application to maths education.
For anyone that doesn't know, the NZ Initiative was formed by merging the Business Roundtable and the NZ Institute. They are far right neoliberal idealogues and you'll see people cycle through the organisation before going into political reporting or lobbying, or in Nicola Willis case being placed into political party roles.
Alas that's not the case anywhere in the world.