The Australian woman has been charged with buying drugs. It doesn’t matter if she bought them with bitcoins, Australian dollars or Qantas air miles. It doesn’t matter whether she bought them in person, on the clear net or on the dark net. Once in a while, you do get these sensationalist headlines
I think it's relevant when writing an article intended to be seen by Bitcoin users, because arrests of criminals using Bitcoin could say a lot about BTC.
It's useful for Bitcoin users to see how much merchant use there is on the darknet in the same way that it's useful to keep track of legitimate merchants, because it could show how many people buy Bitcoin and it could show what Bitcoin's main purposes are to people.
Arrests related to Bitcoin could indicate how Bitcoin's use on the darknet is likely to change, especially if some of these arrests are made through blockchain analysis.
In any case, it's definitely not "sensationalist" as the information is not made to appear more dramatic than it is, and the information is accurate.