It's not like anybody's hiding this. It's even in the article.

"In a bid to cut carbon emissions and air pollution, Norway exempts battery-driven cars from most taxes and offers benefits such as free parking and charging points to hasten a shift from diesel and petrol engines. "

"“It was a small step closer to the 2025 goal,” by which time Norway’s parliament wants all new cars to be emissions-free, Oeyvind Solberg Thorsen, head of the NRF, told a conference. "

It's clearly being driven by a government goal to hit a certain target by a certain year. That's fine (I'd even argue that's how it should be, but that would be beside the point).