I concur absolutely with Andsowego.
Yeah, its pretty offensive (when it comes to writing, because it has nothing to do with it).
But, I think what they're trying to explain with "writing with an accent" is just that a non-native english speaker will write as he/she
pronounce a word (and it could be solved with reading) or how he/she changes the syntax of a sentence.
There are a few programs sold for non-english speakers that emphasizes on "hable ingles, leyendo en español" (learn how to speak english
reading in spanish-kind of phonetically-). That may be the reason behind the "writing with an accent".
As a spanish native and an aspiring writer, I find it very difficult to translate everything. We dont write
as we speak. If we want to be a good writer we should use a rich vocabulary. Somehow in English
composition following that simple rule may sound pedantic.
Anyways, be equally strict no matter what...though, the non-graded draft that suggested someone
is a good thing.