You can but it shifts the burden to the decoder. Since an iron bar over some time period has a finite number of states, there exists a decoder that maps state changes in the iron bar to your Fortnite gameplay.

I think a more fair criticism is that you likely cannot choose the decoder without an oracle (ie the causal relationship would be hard to preserve). I think OPs claim is that consciousness, unlike Fortnite, doesn’t depend on being causally related to some external inputs (thus you don’t need oracle to choose the decoder).