Well, we went from 'dozens of ways to accurately date things' to one (tree rings) that has been shown to be inaccurate pretty quickly.
Like I said, be very skeptical when someone claims to be able to tell you that 'millions of years' even existed, much less what supposedly happened.
It's all in the storyteller's imagination at that point.
I had a similar conversation, sometime back, concerning a fossil that proclaimed three dating methods. Upon close inspection it broke down to just one.