The fence has about 3 feet of concrete at the bottom, an open area covered with detectors and cameras then another smaller fence. The concrete at the bottom would stop a car or truck. ( maybe not a tank!! )
There's a Defence facility not far from YSCB with a fence of that type, which despite a car full of idiot youths hitting it at high speed barely has a scratch on it.
Problem is a fence like that is very expensive, and airport operators are only interested in making money from DFO's and car parks and $8 coffees in the terminal