"There was no attitude of poverty in his poetry" 絶無窮態
穷 shouldn't be taken literally as poverty, instead, it is figurative exhaustion of one's talent; reaching the limit of one's capability. Also I am not sure 振 necessarily means becoming well-known, it could be simply hanging on steadily.

Without further context I would interpret the sentence as


  The poetry he wrote showed no sign of exhaustion, why didn't he keep going?