Is this a lead someone hasn't explored yet?
In the
tweet by the Salmon Youth Centre from 2018 where they shared the letter they received from him (it is almost certainly from the freak barring an overwhelmingly unlikely coincidence), they, very understandably given their perspective that the post card was from an actual child, censored the contact details he mentioned in the post card.
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I cannot find it right now but I remember scrolling across a Reddit post where someone messaged the centre on WhatsApp informing them about the nonce's activity and they replied with something to the effect of "Thanks for making us aware".
Maybe we can reach out to them to get an uncensored version of this image? They would be willing to help given how mainstream this news story is becoming.
It is possible that the freak, in his hubris and titillation, gave his real mobile number and address.
At the very least, it is worth trying. Especially given what is at risk.
The tweet is from 2018, but this should at least allow us to backtrace and confirm his identity - something which is in question right now.