[MrB]

The science that made that determination is incompatible with the premise of a 6,000 year old Earth.

Some extra study on your part, too much to detail here, would show you that this statement is a belief, not a truism.

How can the operational science work fine if the entire premise that it's based on is wrong?

What "entire premise" do you refer to? If I read this right, you're saying that Creation science study somehow refutes the scientific method, or somehow refutes the observations and repetition that we're doing today? How so?

[tacticalogic]

Young Earth Creation science says the world is only 6000 years old.

The physical evidence present and the observed physics of the radiometric decay of long half-life radioisotopes says that’s not possible.