Difference is, TheOther, that in this case, English is the Aussie's native tongue:-) Go to the Ozarks and listen to their Elizabethan locutions, or to Tidewater VA, off the coast and try making sense of some nearly five-hundred year old time-warp English.
My beef is when ESL can be taught by "instructors" who sound more like foreign students of English themselves instead of educated, native American English speakers, simply because they could bribe their way to the top. Then, they rationalize that a foreigner can somehow identify with the errors of non-native English learners. However without a bedrock solid standard, what is the instruction worth if mistakes keep getting reinforced by those as yet too ignorant to know or worse still, to care, about the difference!!
When yours truly was interviewing for such a position in Manhattan during the mid-'90's, I noticed that my future supervisor conducting the interview had a Hungarian accent you could cut with a machete, furthermore, was often grammatically not entirely clear. After the interview, I casually (but well out of earshot) remarked to another teacher upon leaving, that the interviewer sounded more like a student of English than a teacher. "The students won't notice.", replied the instructor.
At point, I asked for my cv back from the Office and left, never to return:-)