If you look into the article, when this is mentioned, there is a relevant link. I think it is worth taking a look at it, because it gives perspective on this topic. Actually, a few, not only one.

The countries with the biggest skews in favour of boys in sex ratios at birth have seen a reversion towards the natural rate.

In a handful of places, the overall birth statistics appear to reflect a preference for girls over boys.

But in most countries, any preference for girls expressed in polls is not strong enough to show in the overall sex ratio at birth. Most parents-to-be seem to balk at sex-selective abortions, in other words.

The assumption that daughters will be more nurturing whereas sons will grow distant is ingrained even in the most egalitarian societies.

Edit: I rewrote the comment, when I realised there are a few links in the article that clarify things

[…] boys will be aborted and neglected in favour of girls

It’s the first time I hear about this. Any relevant links you could share that corroborate this take?

This article is not really about mathematical talent. It mentions that stereotypes might be reproduced by attributing success in girls to diligence and in boys to talent, but it’s about mathematical ability.

At the start of the first school year (when children are five or six years old), there are no differences, on average, between boys and girls in mathematical ability. But after just four months, boys have pulled ahead. The gap widens throughout the year.