I've never heard any argument that demonstrates any certainty around physicalism. I like the argument bcuz it sounds nice, but I would never ever claim to know it to be true. I mostly arrived at physicalism because there are eggregious problems with the other theories and physicalism seemed like the suitable default naive answer.

You might want to look at https://www.reddit.com/r/askphilosophy/comments/46w6qp/comme...

and

https://faculty.philosophy.umd.edu/pcarruthers/NoM%20-%205.p...