I emailed Nelson's and they said no. They are going with FastTrax and WERA. Not sure if I can (or should) post links but you could probably google them.
Are you sure they were not just saying N2 is not on the schedule? It looks like N2 added Nelson sometime after the preliminary schedule last year. And there were Fast Trax days there last year too. Nelson’s website also says the schedule is in progress.
Hopefully N2 will confirm if they know there will be no Nelson days this year.
At this point I don't think that there will be any Nelsons on the schedule for 2023 but I hope it changes. I believe WERA and Fasttrax will be there this season, and I will probably be out there at some point with both organizations. I love riding at that place!