The subs are real.
Ojamajo Doremi and earlier season of Precure dealt with some pretty important topics that real kids have to deal with.
Now they tried to be a bit more subtle with their messages.
Recent episode of Precure had an alien Cactus land on earth and one of the girls who is mixed race connects with it very quickly. They come to learn that it's been rejected from other planets based on how it looks and she kind of understands it but a mistake of plucking a flower in front of it.
The fact they have mixed race female super hero in a show for girl is big. There are lots of mixed children that have to struggle with being different in Japan but it also helps Japanese children to get familiarized with the idea in case they've never met someone who is a Hafu. The episode it's self is nice because it teaches kid not to shun a new kid because they're different looking.