I'm just wondering, how does this statement make sense if we replace the "brain" with "a block of wood" since they are both a "quantum system, just like everyth

I'm just wondering, how does this statement make sense if we replace the "brain" with "a block of wood" since they are both a "quantum system, just like everything else in the universe": "The part of the article that bothers me here the most is a leading lumberjack asserting that a block of wood is not computable. That is demonstrably false: a block of wood is a quantum system, just like everything else in the universe. All quantum systems containing n qubits can be simulated by 2^n classical bits. It may very well be impractical to compute a decent sized block of wood, but that's still technically computable." What would it mean to say that a block of wood is computable?