I'm assuming low. Just looking at the first map in the article, the one zoomed in to Australia and New Zealand... The Tasman Sea looks to obviously separate the two masses for most of what would be their shared extent.

Also, just because continents are touching, does not mean they aren't separate. Europe, Asia, and Africa are all one continuous land mass. (The Suez canal technically separated Africa from Asia, but it certainly doesn't cut through the depth of the entire continent.) And we're only one Bering Strait away from connecting all that to North and South America.

From the article: "(Zealandia)... is believed to have separated from Australlia and Antarctica, as part of Gondwana, about 80m years ago."