Do you mean classical skepticism? How so.
No, just loosely in that if someone observes the world and starts labeling various things as "an illusion" then it creates ideas such as: "we just can't know much about the world because it is all just an illusion".
I intended to indicate anxiety and happiness can be described as illusions, not pain or pleasure.
I apologize that I'm a bit unclear regarding whether you were making remarks regarding the article or whether you we saying what you yourself think is true. (We're all entitled to our own opinions, but the emphasis here on the forum is "what would Epicurus say"
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As for myself, I believe that the experience of emotions and feelings such as anxiety are not an illusion. Yet for a small population of people the cognitions and beliefs that generate those emotions/feelings are. (Here is an article on phobias and disorders).
As for happiness being an illusion, I would venture that perhaps there are greater numbers of people feeling like they can't get the "goods" that lead to a happy life, and they then say "oh well, happiness is just an illusion". But this is cynicism, and the opposite of what Epicurus taught. We would of course would need to compare what exactly all the modern masses of people think that happiness actually is.