Oh look, misleading information about Russia! How rare!
First, the incident the article is referring to is a lawsuit between the guy Sutkin, represented by Roskomnadzor, and Lurkmore. Basically, he sued them for defamation (unsure if this is the correct legal term). This is a common practice in many countries, America included.
There is no law stating that these images are forbidden. It is just that a person may sue somebody for defaming them on the Internet. (Edit for clarification: I think it's a stupid common practice, but that's beside the point) For that, the person has to apply to Roscomnadzor, and after a lengthy period of blabbing, the site administration may be pressured to remove the material in question. Roscomnadzor itself isn't going to do shit unless somebody applies to them, and even then it requires an actual plaintiff to do anything. That is common practice everywhere, I think, but I may be wrong.
The article itself has two sources. One about the case itself (in Russian) and one linking to another similar article in another American newspaper. I haven't been able to find the citation for the corollary it claims exists, and googling it or looking it up on the Roskomnadzor site brings up nothing.
Behold, another fine example of journalistic integrity. But people want to read this kinda stuff, don't they?