Both the sisters who wrote it are. However they also claimed it was a trans-metaphor quite a long time afterwards.
A lot of it doesn’t make sense as a trans-metaphor, so I’m not entirely convinced of this claim. Its a great film, with some horrible sequels.
The vast majority of the films supposed metaphors are mostly around secret knowledge, and discovering that what they were being told was a lie to control.
It could be read as an egg moment, but from the outset many groups were claiming that it represented them and I could easily see why they would say that.
The only reason I said what I did was because so much of it is vague and anything could be read into it.
What was actually made (as the first film) has very few trans-metaphors.