> If there's ever to be a "solution" to the dualism/materialism argument, it cannot possibly end in a "slam dunk" where it turns out that one side or the other was simply nonsensical.
Huh, evolution vs. creationism, many arguments happened over many years, yet one side was simply nonsensical.
> if we ask what "we" know, as a society of scientists and philosophers
That is how science is done; if you reject that approach a priori, no wonder your conclusions become unreliable.
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.