The point isn't that everything can be proven, the point is that human brains have no special abilities that can't be emulated by computers. If you emulate every neuron and neurotransmitter in the brain with a sufficiently powerful computer, you will get an intelligence that has the same perception of love, beauty, blah blah blah that people think somehow set them apart from all other matter in the universe.

In addition, once you have it modeled, its possible invent a computer that loves more deeply than any human ever could. Who understands and appreciates the human concept of beauty better than any human ever could etc.

We know these things are emergent properties of very slow meat processors, and therefore can be recreated again on very fast silicon processors.