This article raises the idea of an interesting reason for belief which could be patternicity, at least for this particular author of this article. They look at all these different aspects that add up to what a real psychic would be, which could be considered a pattern in personality and the actions they commit that make them a believable psychic.

Some red flags that can be seen in all of this include Confusion Of Correlation With Causation and Confirmation Bias. This article seems to conclude that if a psychic is acting a certain way and perform their divination's in a certain way then they must be legitimate. This isn't a correct way of thinking because it allows you to make assumptions with no critical thinking really involved, which can allow you to be scammed by phony fortune tellers.  

Additionally there is some confirmation bias present because the article is assuming that aspects they have noticed on more convincing psychics are defining of them and are proof that they are legitimate fortune tellers/psychics.