Infinite number of things are possible. This article is about Facebook and Instagram, where people make public posts, can be found by searches, and absolutely nothing is end-to-end encrypted. Law enforcement has complete and total access to every single message ever sent over those platforms, which even provide them with an API to query on essentially an honor system trusting that the warrant document LEO submits is legitimate.

It would be equally irrelevant if the Guardian instead of encryption started talking about criminals are aided by guns and explosives in this article.