I feel like the lions could manage to escape if sufficiently provoked - there's no overhang, I don't see any hot wire or anything else that would dissuade a determined lion... there's not even any flex to the upper part of the fence, it's a straight shot
The fence on this cage reminds me of my 2015 visit to Wild Wilderness Drive Through Safari in Gentry, Arkansas. Thankfully that roadside atrocity is now permanently closed.
Here was the Lion exhibit back then (no hotwire anywhere):
Or, even scarier, my visit to Tiger Safari in Tuttle, Oklahoma in 2015. Here was the Amur Tiger exhibit at that time: