I read the article but it left out a lot of details which simply doesn't pass the mustard. The first thing any of the law enforcement agencies would do is obtain a warrant from a judge providing them evidence of wrong doing. Once in hand the warrant would be presented to the ISP.
A simple and cursory inspection of the meta data from the ISP would have immediately told them no such traffic was present.
All of this screams lazy police work and not following any basic investigative best practices as it relates to networking. One could argue maybe 1,2,3 possible incidents which is a stretch but the same spanning years of X vs Y.
Bull shit . . .