Salamun Alaikum.
The Quran does encourage believers to speak words which are straight to the point, well directed, true, just, and appropriate (qawlan sadeedan) 33:70, 4:9.
Indeed, some poetry can be at times intentionally ambiguous and beguiling. However, I am not sure that the Quran intends to condemn 'all' poets out of hand as an exception is also noted by verse 26:227, that implies that some poets can be righteous people, believe, do good deeds and can engage in the remembrance of God.
026.227 (part)
"Except those who believe, work righteousness, engage much in the remembrance of God ..."
There is good, sensible poetry as there is sensible, beautiful singing and good speech. In all things as believers we should strive to seek the best. The Quran encourages moderation. However, in general, you are correct that the Quran seems to distance itself from poetry in general. This may be a strong cue for believers to remain vigilant when it comes to poetry, or at least certain kinds of deliberately ambiguous poetry.
I hope that helps, God willing.
Joseph.