We aren't supposed to learn anything from it, except, perhaps, something about the playful, giggly side of our language, its potential for fun. Hairs on Bears , by Geraldine Ryan-Lush, is supposed to be nonsense. Nothing wrong with the concept, here, nothing at all. But the execution is weak. Because, yes, there's nonsense and nonsense.
Nonsense is language in a mirror, language reflecting on itself.
You can't ignore the details here, because the details are all there is. In fact, this is all I hear. But it cannot commit solecism without a very good reason because language is all it is. Put limp rhyme and lazy grammar in a nonsense verse and it winks itself out of existence. It was never there at all.