radiometric dating assumes the radioactive material half lives can be extrapolated backwards
there is no source isotope that is proven to be so old, so it is a grandiose assumption albeit one much of academia relies on to keep up the lie.
IE you can produce fissile materials that are radioactive and will stay radioactive for a long time, but you know when you produced them. Whereas radiometric dating in the field involves assuming that certain isotopes found naturally could only have gotten there using their initial assumption of where radioactive elements came from
basically a circular reference
in a cataclysm (lord have mercy) lightning can travel through the ground and created fissile material yet they never mention this as a source of radioactive materials in school its always "fusion in stars" which also has never been proven either.
there was a video where they analyzed rocks containing quartz that had embedded radioactive isotopes and when they tested difference components of the rock the rock could be dated from 10000 years, to millions of years and potentially billions of years due to the nature of the half lives of the different isotopes (because they assume a common source for the creation of materials)
In the Beginning: Compelling Evidence for Creation and the Flood - The following items pertain primarily to one theory.