Do you know of any good books about this "projection of modern concepts onto a historical figure" thing? It's something I've been thinking about for a while.
It's not exactly a rigorous explanation of the phenomenon, but it is a good set of case studies.
Also, it should be noted that using modern concepts in a historical setting is not always "wrong" or "bad history". It's pretty clear the author of this article chose to describe Grosseteste the way they did to simplify his work for a broader audience.