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(4.) Traditional 14C testing assumes equilibrium in the rate of formation and the rate of decay.
In fact, 14C is forming FASTER than the observed decay rate.
This is only because it is well calibrated with objects of known age.
Example: wood found in a grave of known age by historically reliable documents is the standard for that time for the C14 content.
Despite this she continually uses the c14 dates to create 'absolute' chronologies.
This is how carbon dating works: Carbon is a naturally abundant element found in the atmosphere, in the earth, in the oceans, and in every living creature.
C-12 is by far the most common isotope, while only about one in a trillion carbon atoms is C-14.
For object over 4,000 years old the method becomes very unreliable for the following reason: Objects older then 4,000 years run into a problem in that there are few if any known artifacts to be used as the standard.
Libby, the discoverer of the C14 dating method, was very disappointed with this problem.