I don't think creationism is nonsensical, it's just wrong. But the concept overall is not nonsensical - in principle, if the universe were very different, a god could have molded humans out of clay and breathed life into them or whatever other fairy tale is preferred; it's not a logically inconsistent, so it's not nonsensical. Even something like Lamarckism is not nonsensical.

If you want to see an obviously nonsensical world view, you need to look at something like the Time Cube "theory". Rovelli is essentially claiming that dualism is more in this area - which I agree with the GP is quite unlikely for such a long discussed and influential philosophical idea.