Havana Syndrome - caused by directed microwaves?

Apparently, back in 2016 dozens of American Embassy diplomats in Cuba felt sick, and this has been dubbed Havana Syndrome. I'd never heard of this, but it came to my attention through an article written by local skeptic Robert Bartholemew.

I met Robert a few years ago when he hosted Joe Nickel here in Auckland. Joe is a veteran skeptical investigator who's done tons of investigations over the years. (And I'm the proud owner of one of Joe's trademark Wooden Nickels!). Anyway, I digress!

Robert is an author and specialises in mass psychogenic illnesses - basically social contagions where a lot of people exhibit some complaint where there's no actual infectious agent.

The Havana Syndrome has been investigated by the US National Academy of Sciences (NAS) and they concluded that the syndrome was likely caused by pulsed RF energy! This seems unlikely to me (but what do I know?). However, Robert has written an article in the Skeptical Inquirer about this explaining the problems with that explanation, and that mass psychogenic illness is much more likely.