> the NYPD has invested $19,500 on the Guardian-HX venture.
That's pocket change to the NYPD. It's not clear from the article what "invested" means, but they probably bought and handed out a small number of launchers to a few officers to see if they prove useful. I'm skeptical that they will.
> That projectile travels at a claimed 37 miles per hour, and has a straight-forward range of 35 feet — though the company claims that, with an arc, it can theoretically reach 60 feet.
Good luck hitting a moving vehicle with that.