I'm more just curious because I haven't seen anything (other than from the authors I've cited) on the effects of fictional (and in particular highly stylized) material on regular people, or even pedophiles specifically. Gary Young's book on The Gamer's Dilemma from 2010 or so also concludes there is no evidence for fictional material having these effects.
What do you mean by "stimulate demand"? For example, it would not surprise me at all that pedophiles find certain depictions arousing, but that still wouldn't be any reason to illegalize it, unless we are to go about banning everything that pedophiles also find arousing (which is a bridge I suspect many would not want to cross). Of course pedophiles are aroused, but are non-pedophilic individuals also aroused? The study on Japanese fans of lolicon manga does not so neatly indicate pedophilia as an appropriate category for their attractions, nor does it explain why they are so defensive against real depictions.
With fictional material, from what I can gather, there's something else at play which does not fit into the commonly held notion that fiction is always (or even most of the time) a substitute for the real deal.
To my mind, the difficult questions are: if the material is arousing to pedophiles, what does that arousal indicate in the risk of an offence (obtaining real CP or otherwise)? Do the effects persist? What is the persistent effect post-orgasm? Are stylized or fictional depicitions sufficient to arouse an interest in the real thing? Is it appropriate or desirable to prosecute or produce policy based on the tastes of pedophiles, especially given that the majority or a high percentage of CSA crimes are not perpetrated by pedophiles?
I've tried quite hard to find material on specifically lolicon manga or fanfiction, and a study among either pedophiles or others. If it does exist, I'd be very interested to see it, and I would have expected it to crop up in the arguments I've had so far. Especially, a study among those who are not already convicted for a crime (contact offence or otherwise). Those results would only, at best, tell us about criminals, and pedophile criminals with NC/C offences are almost reputable for showing lower impulse control.
To put it another way: access to regular porn may inflame the desires of a rapist, and they may even make him more likely to committ an offence; is this sufficient to illegalize porn for everybody? Alcohol may have the same effect, and the question still applies.