He's the one who decided to use the same word to describe both the structure of the universe (atoms and *void*) and a category of desires. Just saying.
I strongly agree that Epicurus' employment of an inflection of the ancient Greek word for "spatial void" to signify "groundless desire" is significant. I see this stylistic device, among few others, as an unmistakable, poetic signature of a unique mind who re-appropriated tired, traditional connotations for the sake of providing fresh observations.
While he re-defines "pleasure", it was not such a drastic leap for the Hellenistic mind to make (unlike, herein, I argue, is the case with "kenos" / "kenon" / "kenen") because "hedone" still referred to "pleasure", just a more stable, fulfilling type of "pleasure" than they may have been used to supposing. Herein, Epicurus is completely re-defining the idea of a "destructive desire". It's not just [1] a "distraction", "addiction", "obsession", "self-destructive pursuit", or "wasted energy", rather, it is [2] "void", "space", "NULL", "literally, within the category of those things which do not exist". The former meaning [1] connects the notion of a "destructive desire", inherently, with desire, itself; with "pleasure". Desire, necessarily, was seen as being a destructive thing. Thus, from an Epicurean vantage point, the word one [2] should describe a destructive desire differently than the pleasure that entices desire, itself, and, rather, needs to be re-defined within a larger context. The destructiveness of desire has nothing to do with the feeling of desire, but rather, with the intellectual vacuity to which by which it may be motivated. If a desire has no natural meaning, no healthy purpose, then it cannot be connected with the natural canon, with raw sensation, honest feeling, and natural anticipations. It must be connected with some kind of fallacious "Logic" that have been mistaken for those original apprehensions impressed upon the mind.