If the earth was made with the appearance of several billion years of age, doesn't that still mean that assuming the conventional geological concept of a multi-billion-year-old earth is the only good scientific theory for producing results?
How would you potentially falsify a theory in which the earth & universe was created with the mere appearance of age? You can't - that's why young-earth-creationism of this sort is not science.
It was all part of the computer matrix to determine the answer to life, the universe, and everything. Just ask Slartibartfast.