So, a little internet searching shows photos of this first surfacing in 2008, with them repeated on a couple sites until it went viral a few days ago. 6 years is a pretty significant length of time with no updates and the same still pictures.
Given that lynx in the wild routinely hunt and eat domestic / feral cats (I know several lost this way), this goes to show what living in a zoo enables.
A lynx in a zoo doesn’t have to go to the effort of hunting its food, and a lot of animals won’t bother to hunt and kill unless they have to. Not being hungry all the time probably has a significant effect on an animal’s aggression level.