I had a feeling they had gotten light to bend around for a minute, but that is a clever way to get around the problem, though I can't say how great it is to have all that expensive technology on a tank thats meant for battle, and could explode at any minute.
Can't say it'd work when it was moving either, as the tank paint would have to react very fast indeed, and I doubt we'd be talking LCD reaction speed here, and it tends to be when tanks are moving, that they are spotted and shot upon, and tanks move pretty fast indeed for their size...
Standing still, it seems the technology would work, but whats the point in that?
"Oh look...a tank. Right, arm missles. Ready?...wait...wheres it gone!? Oh... never mind, its probably gone invisible right where it was. Fire!"
Haha, nice idea though, but they'd also still be suspesptable to heat missile firing, and everything else they can throw at it.