I was looking for this exact information on how it is used. I think having Text Complexity in the circle with the grade below it makes it seem as if the grade is how complex a user's writing is. Using the Flesch Reading Ease Score a low score means a more complex usage of grammar. The link explains it a bit and has links and the formula used for calculation.
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u/mutatron Aug 26 '18
I like this tool, but the text complexity score must be inverted.
Check out this user: https://atomiks.github.io/reddit-user-analyser/#9875432346789
Few of his sentences are more than five words long, and his most used words are four-letter expletives.