This statement needs to be qualified. Unless there was a development breakthrough, energy weapons are still theoretical. Much less for them to be utilized so widely for specific communities of the public to become "well known" targets.
More precisely, energy weapons that cause the specific set of things in Havana syndrome.
Lasers, focused ultrasound, and ADS all count in the broader category and have been developed to the level of getting tested by law enforcement and military — it's just that none of them do anything like Havana syndrome.
There is also the microwave auditory effect, but from what I've read it requires a peak (not average) power so high you'd have to hold the magnetron from a high-end microwave oven against your ear for the effect to be strong enough to do what's been reported.
(This is also why that never got developed past research: in practice it would kill people well before the sound became an annoyance).
My point was that the community of DWE believers know about Seattle. There's entire podcasts dedicated to it.
Importantly however, this doesn't mean that any random embassy jackass claiming to be a victim of one actually was.
Take apart your microwave oven and put the magnetron in a wave guide and point it at your face. Go ahead and tell me its theoretical after that.