The peer review narrative for Earth begins with the desire that the Bible is wrong and hell isn't at the center. One way to do this is to have a timescale which is completely different to the one in the Bible.
Are nuclear decay rates constant or variable? With only 120 years of measurements to work with, and the use of gravitational time dilation to debunk stellar spectroscopy, there's no way to find out.
The evidence that nuclear decay has been constant are measurements of radioactivity which have been made since it was discovered in 1896, about 120 years worth of data.
If the theory of evolution is the centerpiece of the popular science narrative of godless existence (SciPop), then radiometric dating has been the pseudoscientific glue that held it together.
IF nuclear decay isn't constant, AND an initial burst of radiation caused the core of the Earth to melt, THEN material from the lower mantle will melt and fall into the molten core which is why it's expanding.
When God cursed the Earth the nuclear decay began. God's physical presence was the power that maintained matter in a stable condition. God can't tolerate sin, so when sin entered the world he withdrew his presence.
What do you really want out of life? Do you want to fool yourself with SciPop that there's no hell so that you can live this fraught and miserable existence and end up in it?
The fourth axiom of popular science (SciPop) is "nuclear decay has always been constant." It's wishful thinking, a way to induce a rationalization of radiometric data to make rocks look older than they really are.