There seems to be an implicit assumption in the article and in your editorial on proofreading that there is cheating going on "by sanctioning the use of professional help", and that overseas students are having work written for them.
Although I am not on Colin Neville's list of proofreaders, I have frequently checked the English of students I have become friends with, as a favour. This is a matter of checking the accuracy and clarity of the grammar, not the content of the work.
Is having an English speaker correct their grammar and explain their mistakes to them spoon-feeding or education?
Peter Newsome
Bradford University