Correct - because it's a thought "experiment", not a physics experiment. There is an attempt at logical and rational rigor, but there is a reason philosophy is not a hard science.

It doesn't attempt to model the world accurately, it attempts to make concrete understanding from abstract principles. Unlike the sciences, the experiments are not designed to conclusive, they're designed to be instructive.

One could take issue with philosophy as a discipline for working this way, but "them's the rules."