They went back to the caves with more tools, more methods, more questions, and more rigorous documentation.

They collected hundreds of radiocarbon dates instead of a handful.

They subjected additional coprolites to independent blind testing at different laboratories.

They engaged the specific objections about stratigraphic integrity with detailed micromorphological analysis.

And eventually, years after the original publication, their colleagues applied fecal lipid biomarker chemistry to provide the independent confirmation of coprolite identity that DNA analysis alone could not supply.

The result is an evidentiary case that is far stronger than the 2008 paper alone.