Ah, I see that you're correct. I didn't know that.
I imagine that eventually they will use this more. However currently, the location accuracy of such chips is not small enough so as to detect a missed/made field goal by fractions of an inch. It also requires placement of a sensor at each measuring location. So, in last game's case, the tip of the upright would need to have a sensor mounted within it. Likewise, buried wires would need to be installed in the field to accurately measure boundaries and yard lines. This is what NASCAR did all around their tracks for this same purpose.