That is basically nonsense. Lululemon also made similar claims that they were the first to make women’s specific lasts and that nobody does it.
The truth is that men’s and women’s specific lasts are common.
It’s true that not every brand/model uses them, but it’s certainly nothing new. There have been entire brands like Ryka and Avia dedicated to women’s specific athletic shoes. I have seen ads from brands like New Balance and Nike from the 80s talking about women’s specific lasts.
Women’s feet can be different (smaller heel cuboid, wider in the forefoot, different shape instep, etc.). But there are also a huge range within each gender and while I’m not an expert on it, I’ve spoken to a Ph. D. in biomechanics that told me there are more differences within a gender than between them. I haven’t seen the data to know.
What is true is that there’s several different ways to make a women’s last and there are costs and benefits.
If you change the bottom template of the lat (the bottom shape), you generally need to make new tooling which costs a lot.
You can also keep the bottom template and effectively change the upper (heel, instep, etc.) and keep the same tooling but use different lasts and patterns for the upper. Cutting dies are pretty cheap.
There’s also a way to do it to start with the women’s last and then grade to men vs. the other way around which is more typical. This can have better fit for women sometimes.
As you mention, there’s other factors as well to keep in mind in terms of selling by genders. Colorways, size range, size marking, size conversion, etc.
Hope this helps. It’s a topic that is getting a lot of press lately (Lululemon, Puma had a women’s running shoe last year, etc.) but mostly I think misconstrued and marketing spin vs. reality.