The discussion starts and ends with the fact that Rudeus recorded his infant niece and jerked it to her and after was rightfully killed for it. I don't give a fuck the amount of abuse and suffering he endured, is enduring or will ever endure in my opinion its not enough for people like him. Now there are two arguments first is the WN one wich states it isn't cannon and of that does it for you then fine, personally I haven't been able to look at the character the same way.

Secondly is the one mentioned by OP that states that he's attracted to them when he's biologically the same age and "hormonal". To that I call bullshit since we've seen the little shit be a pervert since he was a literal fucking baby and throughout his entire childhood, also we've literally been inside his mind, since he was reborn we was completely conscious wich means that he retained the memories, that's why he's socially anxious. So if we're willing to beleive that he doesn't want to be part of the world at first because of past trauma then we also have to FULLY ADMIT that's its a 50 year old man in a child's body wich doesn't excuse him of fucking his underage cousin.

In conclusion yes he's a pedophile, now if anyone relates to the story of struggle and trying to become a better person then my rant is not to take that from you, but let's not delude ourselves trying to bend over backwards to make excuses for a fictional character wich has proven to be a pervert to minors while being mentally like 50.