It is just that the alligators were not hungry at the time.
Agreed. If it's true that this video was shot at a commercial alligator farm, then I would imagine that the owners are feeding their livestock properly just as any other farmer does. It's in everyone's best interest that the livestock is well fed and therefore not quite as aggressive as they might be out in the wild.
On an Australian vacation I visited an "Animal Park" (Zoo) that featured "fearsome crocs....watch them being fed!". The 'croc show' I went to was in the afternoon, probably the last of several shows for the day. By that time the crocs had probably been fed several times and simply had enough to eat....the chicken dangling in front of their noses was completely uninteresting to them. The handler hit a croc on its back with a rake to get it to open its mouth in alarm, whereupon the handler stuffed the chicken into its mouth. There the croc sat, for the rest of the afternoon, with the chicken in its jaws.....too lazy to either eat it or spit it out.
Similarly at Sea World in Florida the diver had to chase a big shark around the tank, finally cornered him and stuffed some food into its mouth.
That being said, I still thnk that this kitty is lucky....there's no telling what a gator will do when he's presented by a growling cat so close by who is tryng to scratch him.