The author doesn't claim that the imbalance is a reason to doubt the study. His claim is that the imbalance is a reason to doubt the claim that an underlying shift in cultural norms explains why the results might have been valid in 2005 but failed to replicate in 2024.
The author rightly observes that despite the undeniable shift, women are still significantly underrepresented in STEM and therefore that cannot explain the lack of replication. There are still many other reasons besides innate differences that might explain it.
The author rightly observes that despite the undeniable shift, women are still significantly underrepresented in STEM and therefore that cannot explain the lack of replication. There are still many other reasons besides innate differences that might explain it.