She did say that. I'm not going to connect the dots for you as you are obviously lazy and selective but do some deep research on these three organisations - Te Punaha Matatini, Motu.nz and Wigram Capital Investments.
Arden definitely referred to 80,000 in one of her party political broadcasts at 1pm early on in this debacle.
What's more, regardless of what model she did use, the fact is she ignored the Ministry of Health's advice which was we didn't need to go to Level-4.
Further - no one in NZ has died from Covid-19 and no lives were saved because of Lockdown. However we are borrowing the largest amount of money this country has ever borrowed - over $100 billion. That's about 30 x what the USA has invested in research for a Covid-19 vaccine. Go figure!