It doesn't say anything there about deacons giving homilies. In fact, the deacons were ordained so that those whose work was preaching and ministry of the word could concentrate on their primary work without getting lost in more mundane tasks.
Today I had to suffer through another of our parish deacon's twenty minute homilies. Nice guy. Does great work ("prison ministry" -- better him than me!). Terrible voice. Every clause inflected on the same two tones, up down, up down, up down. No variation in tempo. Twenty minutes.
Given that Catholic deacons are cleared to preach nowadays, I might excuse him getting "tasked" with preaching if I figured he was just accepting in humility and trying to make the best of it. Like by trying to get it over with as quickly as possible. Like maybe seven minutes? A brief and to-the-point monotonous drone would not be as sleep- or headache-inducing. But twenty minutes? Twenty minutes speaks to a certain level of taking yourself too seriously combined with a certain lack of self-reflection. Rush Limbaugh used to call it the liberal combination of ignorance and arrogance.
But really. From a scriptural point of view, why are we asking deacons go give homilies? Why do that to such a nice guy?