The reference database used for the Zlatý kůň reconstruction was based on French adult individuals.

This is an important detail.

The statistical model encodes the skull-face relationships that hold in modern French people — specific individuals living in contemporary France, with the facial morphology that reflects their particular genetic background, developmental history, and lifelong environmental influences.

Whether those relationships hold for a woman who lived 45,000 years ago in what is now the Czech Republic is a genuine and unresolved question.

The facial morphology of modern French people has been shaped by tens of thousands of years of population history, genetic selection, admixture, and developmental environmental influences that did not apply to Zlatý kůň.