A foundational assumption of the radiometric dating process is that rates of nuclear decay have always been constant.
If rates were ever different in the past, then estimates based on current decay rates are invalid.
We now know that decay rates do in fact vary. Here is a report on recent discoveries that solar activity significantly alters decay rates (“It’s a gigantic effect…”):
https://physicsworld.com/a/the-mystery-of-the-varying-nuclear-decay/
ICR comments on the experiments here:
https://www.icr.org/content/fluctuations-show-radioisotope-decay-unreliable
Secular scientists used radiometrics to estimate the age of the earth at 4.5 billion years old. This is now completely invalid.
I personally don’t expect anyone to change their mind when confronted with this new evidence. World view assumptions are stubborn things that strongly resist evidence.
Another, related finding that I did not learn until recently:
Lab experiments show that nuclear decay can be greatly accelerated given the right conditions.
See “Billion-Fold Acceleration of Radioactivity Demonstrated in Laboratory”
https://answersingenesis.org/geology/radiometric-dating/acceleration-of-radioactivity-shown-in-laboratory/
The significance of this experiment is that 1) accelerated decay is possible and 2) we can’t rule out that the earth has never been through periods of accelerated decay.