[yorwba]

In 2015 (or some other year), they calculated the bottom quintile (or maybe quartile) score of students on some reading assessment, declared this to be the lowest level of reading competency, and wrote a helpful explanation that people who score at the lowest level of reading competency struggle with simple texts. But there's no single simple text that you could point to where people below the threshold completely fail to understand it and people above the threshold easily breeze through.

Because reading competency isn't binary like that. Reading competency is binary in that complete illiterates cannot read at all and people who aren't complete illiterates typically can read quite a lot, but there probably aren't enough actual illiterates in Denmark to produce scary-sounding statistics. So instead you get arbitrary thresholds that don't mean what they claim to mean.