Now that is a really astonishing leap into absurdity! If the ‘constants’ are changing yet radioactive decay seems to be a consistent rate, don’t you see how that could actually be even more of ‘fine tuning’? Of course you can’t, you’re so nailed to your preconceived notions that there is no sliver of opening for anything different.
If physical constants change without ripping the universe apart, then fine tuning is bogus.
The fact that the changes are in the sixth decimal place indicates that radiometric dating is valid. The error bars in dating techniques are several percent, for any single sample.