I'm not too familiar with this method of dating, however, it has to with the constant change called racemization. Racemization change over time due to temperature. However, it is not constant but rather a slope or else there would be a horizontal line across the graph according to this article.
Geoscience Research Institute | I think we need more research on that...
So it seems that's these changes makes this method useless. How would you explain to someone that say "since the change of this constant is exactly what allows the elapsed time to be determined." Is this true? And how do they know?