here's a story by Theme Park University about the incident:
Did Someone Twist Their Foot Off While Riding The E.T. Adventure At Universal Studios Florida? - Theme Park University
I'm a bit surprised they'd re-open the ride that quickly in the slower season that it is now with these extra measures that are so temporary, on the other hand, maybe it's to publicly give the impression that it's less of a problem than reported if they closed it for an extended period of time.
It does seem odd if this has never happened before in that many years of the ride existing. The ride vehicle is a bit unique though as it's closer to a floorless feeling ride than most others, so there's less of a "keep your legs inside" feeling than more enclosed rides.
I get the impression that people are more used to the idea of keeping their hands and arms inside than their legs.