I'm not sure your point here has much to do with the existential issue I address in the article. Are you saying that nostalgia is wrong because the child's immature interest in sex should be left in the past, whereas pedophiles retain that immaturity?

This seems like quite a stretch. Children may be able to understand mechanically how sex works (in and out), but before puberty they have no interest in sex. I'd say that the mature, grown-up attitude towards sex has more to do with the influence of animality in our so-called elevated species. The truly grown-up, as in transhuman attitude towards sex is more like the ascetic's since the ascetic sees through the shams that sustain "mature" normality in natural behaviour, renouncing those comforts to serve a transcendent ideal.