Many of the schools on the list are tech schools, which attract a lot of foreign students - IIT, NYIT, NJIT. Even the two Ivies have really big engineering schools.
This doesn’t make these schools the big melting pot. My daughter went to a tech school and I asked her if she interacted with many of the foreign students. She said no because the language barrier makes it difficult, especially to socialize. She worked on a project with a student from Taiwan and she said they spent so much (more) time on the project that she couldn’t socialize afterward. My daughter is Chinese (doesn’t speak any dialect) so she’d be included in the diversity numbers, but she didn’t add anything to the ‘world view’ discussed in the report.