OK, so here is my summary of that article.
Epicurus said something like "all sensations are true."
He was arguing against skepticism, and he meant "real" (I would say, "actually experienced") as opposed to "factually correct".
That he didn't mean "factually correct" is abundantly clear from other things he said.
QuoteAs a philosopher he was engaged in the struggle for survival in a den of philosophers, many of them sceptics. Before them he maintained the doctrine that all sensations are true in the sense of real. In practice his attitude was thoroughly pragmatic, like that of the modern scientist. He looked upon sensations as possessing an infinite range of validity.
I also liked the following quote, because it's something I had been thinking myself, as a response to idea that reason cannot refute the senses.
QuoteFar more deceptive...is the third prong of the argument: reason cannot refute the sensations because reason is dependent upon the sensations. This is true in one sense and false in another. The sense in which it is true is this: reason in the aggregate cannot refute sensation in the aggregate, because reason depends upon the senses for its data. The sense in which it is false is this: reason in the aggregate cannot refute the particular sensation.... In this sense, reason constantly refutes the sensations.