TL;DR: Apple dominates the US smartphone market, but EU regulations may offer Android a chance for resurgence by enforcing messaging interoperability and standardizing hardware features.
The statement about a massive majority of iPhones in the Nordics is factually incorrect.
iPhone has a slight lead at one of the biggest vendors Komplett, but that is without counting the remaining 10 % which is almost exclusively Android units.
For clarity: Komplett operates in all the Nordic countries, but I would assume these numbers are for Norway, the richest of the bunch.
It's the same story at work where I am the responsible party for company phones: Pretty evenly distributed where some of the iPhones are chosen due to MLM solutions for those wishing certain solutions.
I can only speak for my own age group in my personal life, but I would say Android has a quite big lead with young adults.
Kids/teens might be a completely different story though.