Why're you simply posting nonsense and dragging on with this most trivial point when the meaning is crystal clear?<quoted text>
"Literature on" implies either critique or discipline specific (e.g. scientific) literature.
I use the term Scientific literature all the time.
That implies peer review and professional methodology.
You've failed to get his logic.
He's correct in a sweeping sort of way.
The word literature can mean many things in different contexts and does not necessarily refer to language studies as say for example studying Macbeth as part of English Literature.
Besides, research findings and discussions in any technical or non-technical subject are conducted in a language where use of vocabulary, alphabetical symbols, rules of grammar, correct spelling, etymology and the like are used freely and all throughout and without these language inputs they'd be no thoughts, no research, no science, no math, no medicine, no Macbeth and no history.