Hmmm…
From what little I know, in most jurisdictions it is illegal to possess child porn. From what I read in the papers, most places do not need anything more than possession to charge - at least, a lot of cases in the news seem to be nothing more than possession. The law is pretty simple - you have it you possess it. As jezzaOZ says there are various excuses, but I assume that if it is found on your computer, the onus is on you to show “a virus did it” or “someone else did it”, etc.
I would think that like possession of drugs and similar cases, if you have it and recognize it and make no effort to immediately get rid of it and alert authorities, then the assumption is you got it for the purpose of keeping it. I would imagine unless the circumstances are pretty simple, the police and prosecutor would be pretty ticked at someone “advertising” a source of CEM even in the name of trying to stop it. If your story is “Dick Johnson is running for congress, but this is what you find on his blog” then once you have your one example blurred photo, what possible reason could you have for not alerting authorities first? (Of course, if you’re someone looking for that material why would you go to a website identified by the mainstream media? It just reeks of being a trap.)
So the answer to the OP is, technically the reporter is breaking the law. If he’s clever and covered his tracks, there may not be the evidence to charge him; assuming the blurred photo does not qualify. If it appears to be a legitimate news story, perhaps the prosecutor would not see value in prosecuting; but for a titillating bit posing as expose, I doubt the DA would be as understanding.
I recall reading of a case back in the 90’s; the defendant was charged over some videotapes he had ordered from a magazine ad. The videos showed some girls (about 10 years old?) bumping and grinding in tight leotards, and according to the article, the camera zoomed in on the crotch frequently. The way the federal law was written (is written?) the child did not have to be naked, an excessive focus on the genitalia as still sufficient to qualify as CEM. So don’t assume blurring is sufficient.
(The ad had said “100% legal!!” and the prosecutor was quoted as saying the people selling these tapes were certainly not qualified or motivated to be sure they were legal. No word about prosecuting the sellers, making me think it was a sting from the start)
As for manufacturing, if someone made CEM but you had no evidence of distribution or possession, what do you have? Most likely the evidence of a victim and nothing more… at which point the case is child abuse and hinges on the credibility of the victim?