I'd put the concern differently

It is about conceptual and actual impositions upon children. The point is surely that we, as girl lovers, don't try to do this.

Opposers of child sexuality impose upon children: they try to "de-sexualise" them conceptually by denying that they are sexual beings. OTOH, we, as girl lovers, do not "sexualise" children, we simply recognise and accept the evidence that children are, obviously, sexual people.

De-sexualising is probably one of the most obvious examples of imposing on children, but there are plenty of others. Parents and segregated schools trying to turn kids into religious clones is one other obvious instance. As to movies, I largely agree with what LGS said, though some movies (and novels, etc.) may be used to push certain conceptions of children which are not helpful in terms of respecting their autonomy.