I don't know for sure but I suspect that the items stolen are not generally survival type things. Watches, cameras, travelers checks, jewelry, high end clothing, and electronics; luxury, eye catching and easily resalable items, seem more likely to be targeted.
The article cited: ... "laptops, flat screen TV's, cameras, iPods, and GPS units. Also taken were five foot tall wooden carved African masks, jewelry, watches and earrings."
I doubt most thieves are sleeping bag, canteen and backpack types. Most seem more acclimated to the urban rumble and bling than roughing it in the woods.
Of course, you never know. So reasonable precautions are wise. Some European travelers have invested in wire-cable net bags and many airports will inspect and then shrink wrap your bags for a price but I really wouldn't worry too much about my survival gear.