Gravity is also referred to as a theory , so sick as is relativity. That does'nt mean they are not established facts.
You cite professor Russ in your conclusion that carbon and other types of dating methods are inaccurate . If so, how far off are they and why? Were dinosaurs here 5000 years ago. Find a professor of chemistry, genetics, physics, astronomy , biochemistry , biology anthropology etc from MIT, UC Berkeley, Caltech, Stanford, Yale or any top tier university who thinks carbon dating is bogus or even speculative. It explains too much in too many divergent fields of science.