No. God saw what they did—how they turned from their evil way—and God relented of the disaster he had said he would do Jonah 3:10. The chapter ends by stating that he did not do it Jonah 3:10.
In Jonah 3:10, the story closes this scene by reporting what God noticed and how God responded. God sees the Ninevites’ actions, especially that they changed direction away from their harmful behavior. Because of that change, God does not carry out the announced disaster. This verse is the final line of the Nineveh episode (Jonah 3:1–10). Jonah has delivered a brief warning, the city has responded with widespread fasting and humility, and the king has called everyone to stop their violent behavior and turn from wrongdoing.
The verse presents a clear cause-and-effect within the story: God observes what the Ninevites actually did, and God withholds the announced disaster.
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Jonah 3:10, then read the surrounding section so the answer stays connected to the passage's flow.
10God saw their works, that they turned from their evil way. God repented of the evil which he said he would do to them, and he didn`t do it.