How should I interpret advisor overly positive feedbacks?
That’s a good sign. Not all the advisors would take pains to provide you with lots of English corrections. I suggest that you make sure all corrections are made. Some people in academia may be very negative about a paper written in bad English. It might have a very negative impact. You may ask American students to help you out with this simple task of editing your work. Then your advisor might switch to some other recommendations or critique. It might make your work even better if you accelerate the editing in this way. Your advisor will undoubtedly be very impressed. And I’m almost sure some other improvements will be suggested to you apart from constant English language corrections. I would have given the same feedback. I mean first things first. Language should not be dismaying; otherwise, as I said, it can have a very negative impact on your work, while it’s the contents the paper should be judged on. It’s good that your advisor is ready for the nitty-gritty job of plowing through the language of your paper. That’s commendable.