I always have the same "duh" attitude about stories like this one, but I'm realizing more and more that warnings like this are needed because so many people are profoundly stupid.
I would never even buy the knock off colognes people sold out of the trunks of their cars or food/beverages sold by people living on golf courses. Common sense says to not trust that stuff. Although, this seems like it'll be really dated as the pot industry gets more regulations and people are buying their vape pot from legit retailers.
That being said, most olive oil isn't olive oil, so who fucking knows?