I think one fundamental flaw in this study is that Word is a text editor and LaTeX is a markup format. It is just strange to compare a markup format to an editor. For LaTeX they list that at least "TeXnicCenter, LaTeX Editor, Kile, or WinEdit" were used. Word has a lot of helpful features for writing English Word documents (might be less helpful with Quechua) but the helpfulness of the editor varies greatly in the LaTeX world. As an example of the strangeness of this comparison, it is possible to produce LaTeX text files in Word. The painful process of doing so is a great example of how the editor matters.

So this major confusion on the part of the authors may be why LaTeX users seem so error prone. I hope no one is influenced by this paper. The authors fail to comprehend the nature of what they are studying.