Throughout Real English®, you will find non-native speakers of English from time to time. However, they don't make any mistakes when they speak, for videos used in the Lessons.
This is different. Lorena makes some obvious mistakes which are typical of "Upper Intermediate" students.
Students seem to identify with other speakers of English as a Second Language. I think it's a motivator to include the non-native speakers. On the other hand, is it valid to present a student with a video of mistakes?! Maybe it is, if you edit in the video in a certain way. I don't know. You're the judge: