ah yeah - we watched this during literacy training. And it’s true of our school library (and I suspect most)
Without being dismissive - because I think it has been a big problem in the past - I really think you are talking about an issue that is currently already being addressed. As I said earlier - and as a PP who is an illustrator of children’s books has said - publishing is really switched on to this now.
That video uses old data to make its point ... and, crucially, it is a marketing video. It is making its case very effectively but it is selling an idea to get you to buy a book. It’s not academic research. One of their points of reference is a Time list of Top 100 Children’s Books - that’s an issue of bias on the compilers of the list, I’d argue. The contributors to that list probably were white male journalists and it’s an opinion piece. Can’t tell because they don’t cite the date of the data they’re using.
I think it’s great that educators, librarians and the wider world recognise it’s been a problem and look to redress the balance in what they buy in to libraries now.
But I also think it’s crucial not to devalue all the female characters in children’s literature who are fully realised rounded people of all types of girl, and always have been. Personally I loved Enid Blyton growing up, and I particularly loved the ‘tomboy’ characters. If you read them now they’re horribly dated but it’s unfair to say I loved them just because that’s all there was for girls. It’s not true. Judy Blume - fantastic rounded female characters. Noel Streatfield - ambitious hardworking girls. Anne of Green Gables, the Secret Garden, Carrie’s War, Nancy Drew...
There’s even more choice now, which is brilliant.
Children’s books should offer both mirrors and windows. Mirrors to see yourself reflected on the page - ethnicity, culture, appearance, personality. Windows to allow you to experience something different, to look into other worlds, other perspectives.
You can’t proscribe that creatively. But as the end consumer (as a buyer of children’s books for your DD and for your school library) you can use your purchasing power to send a message ( which is why Goodnight Stories for Rebel Girls did so well ... helped by effective marketing
)