Do you see God actually changing His mind, or simply showing mercy, instead of judgement?
Jon 3:10
And God saw their works, that they turned from their evil way; and God repented (μετενόησεν) of the evil, that he had said that he would do unto them; and he did it not.
THe LXX uses metanoeO, to change one's mind.
- to change one's mind, i.e. to repent
- to change one's mind for better, heartily to amend with abhorrence of one's past sins.
So, yes, scripture says God changed His mind.