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A person named Jamie Reed is saying that children are using words like “mushroom”, “rock”, and “helicopter” as pronouns. That’s not the same as claiming that children are identifying as those things.
Not playing semantics here, people with he pronouns don’t ‘identify as hes’ either.
According to wikipedia, noun-self pronouns have been in use since the 2010’s. I doubt that people using kitten/kittenself could be said to identify as kittens.