You can get such lasers off the shelf right now - a laser that can cut through steel is going to be able to cut through pretty much anything else you could throw at it, and thickness only affects how LONG it takes to cut through. So the claim that a laser can cut through the strongest armor is, by itself, meaningless. How big is the laser? How portable? How fast can it cut through what? How fast is the targeting? What's the range on it (lasers do not have infinite range, the beams do diverge)? Being able to cut through heavy armor isn't enough to make a laser an effective weapon.
I haven't heard of any rumors about Uruguay working on military lasers, but I have no reason to think they're doing anything significant, or that we'd really care about whatever they are doing. We have some ABM lasers ourselves, including this nice little
experimental platform for an airborne laser. I seriously doubt Uruguay has anything comparable, and the system I linked to does NOT penetrate "the strongest armor".