Pedophile, paedophile, sexual paedophile
Dictionaries are descriptive not normative and words obtain meaning by usage, there is no other linguistic authority beyond usage.
Natural languages are living languages that change over time. (Actually most of the artificial languages seem to change over time a well.)
Maybe at some point in the past pedophile meant something else, but today it is equivalent to sexual pedophile.
PS I am betting that before they went public with a name they had more a bit more than tips based on unscrambled images.
Also I am guessing that with that many photos there must be moles, scars, tattoos ... something to uniquely identify him once they have in in custody.
I also have to chime in against police brutality and vigilante justice, its very important that people get a fair trail, especially in these cases.
From what I hear people in prison have pretty much the same attitude toward these sick bastard so there is no need to rush things.
Also court cases tend to go better in these countries when the international press is paying attention. No judge is getting bribed in this case.