I can see myself using this video as a teaching tool. I'd use it to teach children to look below the surface of an online video, and analyse the content.
I can see it being very useful as part of the curriculum that teaches them critical thinking skills and helps them spot the techniques used in advertising and online videos that aim to manipulate them, and do not have their best interests at heart.
I'd want to help them them to recognise the tricks the presenter is using, coming up with their own suggestions as to what might have motivated her to choose that syrupy, sing song voice, the chalk board, scattered crayons, and the "Teddy is my best friend" schtick.
Then I'd ask them to consider the "gender assigned at birth" statement. What really happens when a baby is born? How do we know what sex a baby is? Then I'd ask them if they thought all boy babies grew up to have be interested in doing the same things? What does it mean if a girl prefers playing with "boy" toys or a boy likes "girl" toys? Is it possible for adult males to enjoy cooking and keeping the house tidy? Do grown women ever use power tools? Does it make them any less male or female if they do those things?
I'd show them photographs of children from the past and ask if they could spot which were the girls and which were the girls? Looking at formal portraits from centuries past when they all wore dresses and had long hair, and then photographs from the 30's, 60's, 70's and 80's. Including photos of David Bowie, Adam Ant, Joan Armatrading and Annie Lennox, asking if they could tell which of them was male and which was female?
Then I'd ask them to consider why the Queer Kids videos were made. What was their intended influence? Who was the target audience? What does the presenter gain from making those films and getting children to watch them?
That's just off the top of my head, but I do think that children are susceptible to to pernicious online propaganda, and teaching them how to spot fraud, lies and unsavoury intent so that they have some defence against the things they'll encounter online is important. Year six is probably a reasonable time to start equipping them to resist online manipulation, you can't leave it too late or their immaturity and inexperience will make them easy prey.