Irony in The Forgotten Poet

In the poem The Forgotten Poet, the narrator reflects on the life of a once-renowned poet who now lives in obscurity, surrounded by trinkets of past glory.

Lines from the poem state:

"He scribes his verses on the dust,
Forgotten echoes in a crowded hall,
Harmony once soared from his pen,
Now silence clings, a haunting thrall."

Identify the use of irony in the narrator's depiction of the poet's current situation.