The NN in the article is based on handwriting, so comparing WPM to handwriting is a better apples-to-apples comparison than typing:

> Studies compiled by Amundson (1995) show that copying rates using handwriting at the 1st grade level are about 5 words per minute (WPM) on average, but by the end of elementary school at the 5th and 6th grade level are about 10 to 12 WPM.

Source https://www.montgomeryschoolsmd.org/departments/hiat/resourc...