Is this even possible?

I found this list of healthy snaks. The author claims that they are all under 100 calories. It just doesn't seem right to me. How can this hummus dish be under 100 if it contains 2 tbl spoons of olive oil? Guacamole made of 3 avocados 900 cals? Does not seem right. Could someone have a look? Either I seriously overestimate teh caloric value in food I eat or there is something wrong with this list.
http://www.youbeauty.com/nutrition/galleries/10-snacks-under-100-calories