Methods for dating the earth
Assuming good faith qua ignorance, this attack is simply a misconstruction of uniformitarianism - as a scientific assumption it does not claim that major disruptive events like ice ages, meteor impacts, earthquakes, volcanic eruptions and so on have never happened (since plenty of people alive today have witnessed or been affected by one or more of them), but rather that the specific physical laws governing their causes and effects have remained constant over time.
Assuming good faith qua scientific disagreement with uniformitarianism, none of the creationist theories predicated on alternatives to the constancy of physical laws over time can be valid without encountering big problems very quickly; cf.
No scientific method can prove the age of the universe or the earth, and that includes the ones we have listed here.
A single observation of a wildly discordant estimate is not enough to overturn the concordant estimates, because observations are always subject to errors and outliers.If the calculated result gives an acceptable age, the investigators publish it.