I don't buy it...
I don't think these things are for making people "sick". You're shooting a beam 4km in daylight - pretty energetic beam. Anything too much closer, it's gonna start burning retinas...
But, you see, it's MARKETED as a "safe weapon"...so there is limited liability. The fact that the pirates/paps were temporarily or permanently blinded is a function of their persistence when faced with a non-lethal weapon - in short, it's their fault!
And I bet that in a pinch, any scanning or pulsing technology on that gun can be overridden to produce a really, really powerful beam - not one that will burn, but one that will blind. And it doesn't take much - I lost my red eyesight in one eye from a couple of fast exposures to a weak Class III HeNe laser decades ago when building a laser show (damned mirror slipped its mounts when I was testing it and had the box open).
I think that may actually be a much better deterent to piracy than any lethal weapon - the thought of becoming blind, in a society (Somalia, etc.) that has no provisions for the blind....