Basically Nats just pulled a bit lower number out of the hat. A bit similar like they were at the start of the whole pandemic when they did not want to close the borders.
So great the Nats were not in government during this period.
It's good to have plans, just without or low vax, planing is pointless.
Ironically if the Nats were in government first came about, it would have been under the leadership of English, and I would have trusted him to manage this pandemic in a heartbeat over the current crop.