his letter, Å represents various sounds in several languages. It is a separate letter in the Swedish, Danish, Norwegian, Finnish, North Frisian, Walloon, Chamorro, Lule Sami, Skolt Sami, Southern Sami, and Greenlandic alphabets.
"«Bokstavrett» nynorsk er det svært få som snakker i uoffisielle sammenhenger. Dialektbasert nynorsk har vært mer brukt, men ingen har talt brukerne."
Even the 4 counties that has nynorsk as an official written language don't talk like it's written but use dialects which are closer than the rest of the country. Nynorsk is after all just a written language put together using multiple dialects.
It's more "typical pre-highschool thinking" to say everything or most dialects that are not eastern Norwegian is nynorsk and that everyone from Oslo-area speak bokmål.
It's a common mistake when almost every city in Norway have their own distinct dialect (or add some special flavor to the main dialect from their region).