Even at my son’s midwest college there are professors and TAs that have accents. I just asked him about this. He said he has had a few professors with accents but nothing too bad but several engineering and higher level math students have complained that they have trouble understanding a couple of professors or TAs. The TAs and LAs (like undergrad TAs) have to go through a class where they work on communication and there isn’t much trouble in classes where the pool to select from is large. In higher level specialized classes there may no be as big a selection pool for TAs and many professors have accents of various kinds. I’m not sure you will be able to totally remove this from the mix at any school. Working with the disability office may be the best thing. They may be able to provide notes from the lectures.