Half of that 60% is citations in research. Hardly surprising again that the Anglo universities get a guernsey there, given that English is the lingua franca these days, particularly in science. If a university only publishes in English, then it's going to get a wider citational audience as compared to splitting its output between French and English.
Ultimately, in the context of the discussion here, the concern is the quality of teaching, not the quality of research. While there is an interaction between the two, they are not synonymous.