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While I agree with most of the article, I am not sure about countermeasures. I like downvotes, but this opens another form of trolling.
Also I want people to be confronted with stuff like non-facts. It means that you should better check stuff on your own and not take things as granted. This is especially important for democratic societies.
I think the best counter measure against everything is society. An example. If society doesn't like smokers and drug abuse in general, don't call it hip and rebellious, but disgusting and weak. After all you depend on and even are kinda enslaved to a piece of crap and its producers. On the other hand simply don't give them attention.
As the article says trolls are immature. Children (and also adults) usually want attention, so simply not giving them any for bad stuff will make them do something else. It's a simple form of punishment that actually is not awarding certain behaviors.
It's how peer pressure works. Societies simply reward certain behavior with attention and recognition. It's also why some people, like managers sometimes become greedy and amoral. Society rewards it with money and financially successful people get lots of rewards and praise.
See the US presidential election. Being a successful businessman was a plus, not paying a lot of taxes is a minus. Even though trolls also want to influence things somehow. You won't get rid of them, so lets just deal with them.