We estimate that 3.4 billion people experienced some form of neurological health loss in 2021, which is a staggering number. This is largely due to certain conditions that are widespread. For example, tension-type headaches affected about 2 billion people in 2021.
Seems like they goosed their numbers here for a headline. Tension headaches aren't well understood, but they're generally not neurological.
No shit they're here on a student visa. This isn't new.